Krikri: Advancing Open Large Language Models for Greek.

Prokopis Prokopidis Dimitris Roussis Leon Voukoutis Georgios Paraskevopoulos Sokratis Sofianopoulos Prokopis Prokopidis Vassilis P. Plagianakos Athanasios Katsamanis Stelios Piperidis Vassilis Katsouros Krikri: Advancing Open Large Language Models for Greek. EMNLP (Findings) 2025 5012-5033 conf/emnlp/2025f https://aclanthology.org/2025.findings-emnlp.268/ db/conf/emnlp/emnlp2025f.html#RoussisVPSPPKPK25 streams/conf/emnlp

Dimitris Roussis Leon Voukoutis Georgios Paraskevopoulos Sokratis Sofianopoulos Prokopis Prokopidis Vassilis Papavasileiou Athanasios Katsamanis Stelios Piperidis Vassilis Katsouros Krikri: Advancing Open Large Language Models for Greek. 2025 May abs/2505.13772 CoRR https://doi.org/10.48550/arXiv.2505.13772 db/journals/corr/corr2505.html#abs-2505-13772 streams/journals/corr

Francisco Casacuberta Alexandru Ceausu Khalid Choukri Miltos Deligiannis Miguel Domingo Mercedes García-Martínez Manuel Herranz Guillaume Jacquet Vassilis Papavassiliou Stelios Piperidis Prokopis Prokopidis Dimitris Roussis Marwa Hadj Salah Findings of a Machine Translation Shared Task Focused on Covid-19 Related Documents. 26-35 2024 SEPLN Posters https://ceur-ws.org/Vol-3846/paper03.pdf conf/sepln/2024p db/conf/sepln/sepln2024p.html#CasacubertaCCDD24

Leon Voukoutis Dimitris Roussis Georgios Paraskevopoulos Sokratis Sofianopoulos Prokopis Prokopidis Vassilis Papavasileiou Athanasios Katsamanis Stelios Piperidis Vassilis Katsouros Meltemi: The first open Large Language Model for Greek. 2024 abs/2407.20743 CoRR https://doi.org/10.48550/arXiv.2407.20743 db/journals/corr/corr2407.html#abs-2407-20743 streams/journals/corr

Dimitrios Roussis Vassilis Papavassiliou Sokratis Sofianopoulos Prokopis Prokopidis Stelios Piperidis Constructing Parallel Corpora from COVID-19 News using MediSys Metadata. 1068-1072 2022 LREC https://aclanthology.org/2022.lrec-1.115 conf/lrec/2022 db/conf/lrec/lrec2022.html#RoussisPSPP22 Dimitrios Roussis Vassilis Papavassiliou Prokopis Prokopidis Stelios Piperidis Vassilis Katsouros SciPar: A Collection of Parallel Corpora from Scientific Abstracts. 2652-2657 2022 LREC https://aclanthology.org/2022.lrec-1.284 conf/lrec/2022 db/conf/lrec/lrec2022.html#RoussisPPPK22

Francisco Casacuberta Alexandru Ceausu Khalid Choukri Miltos Deligiannis Miguel Domingo Mercedes García-Martínez Manuel Herranz Guillaume Jacquet Vassilis Papavassiliou Stelios Piperidis Prokopis Prokopidis Dimitrios Roussis Marwa Hadj Salah Findings of the Covid-19 MLIA Machine Translation Task. 2022 abs/2211.07465 CoRR https://doi.org/10.48550/arXiv.2211.07465 db/journals/corr/corr2211.html#abs-2211-07465

Andrea Lösch Valérie Mapelli Khalid Choukri Maria Giagkou Stelios Piperidis Prokopis Prokopidis Vassilis Papavassiliou Miltos Deligiannis Aivars Berzins Andrejs Vasiljevs Eileen Schnur Thierry Declerck Josef van Genabith Collection and Curation of Language Data within the European Language Resource Coordination (ELRC). 2021 Qurator https://ceur-ws.org/Vol-2836/qurator2021_paper_6.pdf conf/qurator/2021 db/conf/qurator/qurator2021.html#LoschMCGPPPDBVS21 Prokopis Prokopidis Stelios Piperidis A Neural NLP toolkit for Greek. 125-128 2020 SETN https://doi.org/10.1145/3411408.3411430 conf/setn/2020 db/conf/setn/setn2020.html#ProkopidisP20 Vassilis Papavassiliou Prokopis Prokopidis Stelios Piperidis Discovering Parallel Language Resources for Training MT Engines. 2018 LREC conf/lrec/2018 db/conf/lrec/lrec2018.html#PapavassiliouPP18 http://www.lrec-conf.org/proceedings/lrec2018/summaries/604.html Vassilis Papavassiliou Sokratis Sofianopoulos Prokopis Prokopidis Stelios Piperidis The ILSP/ARC submission to the WMT 2018 Parallel Corpus Filtering Shared Task. 928-933 2018 WMT (shared task) https://doi.org/10.18653/v1/w18-6484 https://aclanthology.org/W18-6484/ conf/wmt/2018s db/conf/wmt/wmt2018s.html#PapavassiliouSP18

Antonio Toral Miquel Esplà-Gomis Filip Klubicka Nikola Ljubesic Vassilis Papavassiliou Prokopis Prokopidis Raphael Rubino Andy Way Crawl and crowd to bring machine translation to under-resourced languages. 1019-1051 2017 51 Lang. Resour. Evaluation 4 https://doi.org/10.1007/s10579-016-9363-6 db/journals/lre/lre51.html#ToralEKLPPRW17

Prokopis Prokopidis Haris Papageorgiou Universal Dependencies for Greek. 102-106 2017 UDW@NoDaLiDa https://aclanthology.org/W17-0413/ conf/acludw/2017 db/conf/acludw/acludw2017.html#ProkopidisP17 Ryder Wishart Prokopis Prokopidis Topic Modelling Experiments on Hellenistic Corpora. 39-47 2017 CDH@TLT https://ceur-ws.org/Vol-1786/wishart.pdf conf/tlt/2017cdh db/conf/tlt/cdh2017.html#WishartP17 Antonio Toral Sergio Ortiz-Rojas Mikel L. Forcada Nikola Ljubesic Prokopis Prokopidis Abu-MaTran: automatic building of machine translation. 2016 EAMT (Projects/Products) https://aclanthology.org/2016.eamt-2.19/ conf/eamt/2016pp db/conf/eamt/eamt2016pp.html#ToralOFLP16 Prokopis Prokopidis Vassilis Papavassiliou Stelios Piperidis Parallel Global Voices: a Collection of Multilingual Corpora with Citizen Media Stories. 2016 LREC http://www.lrec-conf.org/proceedings/lrec2016/summaries/778.html conf/lrec/2016 db/conf/lrec/lrec2016.html#ProkopidisPP16 Vassilis Papavassiliou Prokopis Prokopidis Stelios Piperidis The ILSP/ARC submission to the WMT 2016 Bilingual Document Alignment Shared Task. 733-739 2016 WMT https://doi.org/10.18653/v1/w16-2375 https://aclanthology.org/W16-2375/ conf/wmt/2016 db/conf/wmt/wmt2016.html#PapavassiliouPP16

Pavel Pecina Antonio Toral Vassilis Papavassiliou Prokopis Prokopidis Ales Tamchyna Andy Way Josef van Genabith Domain adaptation of statistical machine translation with domain-focused web crawling. 147-193 2015 49 Lang. Resour. Evaluation 1 https://doi.org/10.1007/s10579-014-9282-3 https://www.wikidata.org/entity/Q35775926 db/journals/lre/lre49.html#PecinaTPPTWG15

Antonio Toral Flammie A. Pirinen Andy Way Gema Ramírez-Sánchez Sergio Ortiz-Rojas Raphael Rubino Miquel Esplà-Gomis Mikel L. Forcada Vassilis Papavassiliou Prokopis Prokopidis Nikola Ljubesic Abu-MaTran: Automatic building of Machine Translation. 2015 EAMT https://aclanthology.org/W15-4944/ conf/eamt/2015 db/conf/eamt/eamt2015.html#ToralPWROREFPPL15 Raphaël Rubino Flammie A. Pirinen Miquel Esplà-Gomis Nikola Ljubesic Sergio Ortiz-Rojas Vassilis Papavassiliou Prokopis Prokopidis Antonio Toral Abu-MaTran at WMT 2015 Translation Task: Morphological Segmentation and Web Crawling. 184-191 2015 WMT@EMNLP https://doi.org/10.18653/v1/w15-3022 https://aclanthology.org/W15-3022/ conf/wmt/2015 db/conf/wmt/wmt2015.html#RubinoPELOPPT15 Miquel Esplà-Gomis Filip Klubicka Nikola Ljubesic Sergio Ortiz-Rojas Vassilis Papavassiliou Prokopis Prokopidis Comparing two acquisition systems for automatically building an English-Croatian parallel corpus from multilingual websites. 1252-1258 2014 LREC http://www.lrec-conf.org/proceedings/lrec2014/summaries/529.html conf/lrec/2014 db/conf/lrec/lrec2014.html#Espla-GomisKLOPP14 Vassilis Papavassiliou Prokopis Prokopidis Gregor Thurmair A modular open-source focused crawler for mining monolingual and bilingual corpora from the web. 43-51 2013 BUCC@ACL https://aclanthology.org/W13-2506/ conf/acl-bucc/2013 db/conf/acl-bucc/acl-bucc2013.html#PapavassiliouPT13

Núria Bel Vassilis Papavassiliou Prokopis Prokopidis Antonio Toral Victoria Arranz Mining and Exploiting Domain-Specific Corpora in the PANACEA Platform http://arxiv.org/abs/1303.1932 2013 CoRR abs/1303.1932 db/journals/corr/corr1303.html#abs-1303-1932

Pavel Pecina Antonio Toral Vassilis Papavassiliou Prokopis Prokopidis Josef van Genabith Domain Adaptation of Statistical Machine Translation using Web-Crawled Resources: A Case Study. 145-152 2012 EAMT https://aclanthology.org/2012.eamt-1.38/ conf/eamt/2012 db/conf/eamt/eamt2012.html#PecinaTPPG12 Pavel Pecina Antonio Toral Andy Way Vassilis Papavassiliou Prokopis Prokopidis Maria Giagkou Towards Using Web-Crawled Data for Domain Adaptation in Statistical Machine Translation. 2011 EAMT https://aclanthology.org/2011.eamt-1.40/ conf/eamt/2011 db/conf/eamt/eamt2011.html#PecinaTWPPG11 Pamela Forner Anselmo Peñas Eneko Agirre Iñaki Alegria Corina Forascu Nicolas Moreau Petya Osenova Prokopis Prokopidis Paulo Rocha 0001 Bogdan Sacaleanu Richard F. E. Sutcliffe Erik F. Tjong Kim Sang Overview of the Clef 2008 Multilingual Question Answering Track. 262-295 2008 CLEF https://doi.org/10.1007/978-3-642-04447-2_34 https://www.wikidata.org/entity/Q57400836 conf/clef/2008 db/conf/clef/clef2008.html#FornerPAAFMOPRSSS08 Pamela Forner Anselmo Peñas Iñaki Alegría Loinaz Corina Forascu Nicolas Moreau Petya Osenova Prokopis Prokopidis Paulo Rocha 0001 Bogdan Sacaleanu Richard F. E. Sutcliffe Erik F. Tjong Kim Sang Overview of the CLEF 2008 Multilingual Question Answering Track. 2008 CLEF (Working Notes) https://ceur-ws.org/Vol-1174/CLEF2008wn-QACLEF-FornerEt2008.pdf conf/clef/2008w db/conf/clef/clef2008w.html#FornerPLFMOPRSSS08 Prokopis Prokopidis Vassia Karra Aggeliki Papagianopoulou Stelios Piperidis Condensing Sentences for Subtitle Generation. 2008 LREC http://www.lrec-conf.org/proceedings/lrec2008/summaries/328.html conf/lrec/2008 db/conf/lrec/lrec2008.html#ProkopidisKPP08 Harris Papageorgiou Elina Desipri Maria Koutsombogera Kanella Pouli Prokopis Prokopidis Adding multi-layer semantics to the Greek Dependency Treebank. 975-980 2006 LREC http://www.lrec-conf.org/proceedings/lrec2006/summaries/749.html conf/lrec/2006 db/conf/lrec/lrec2006.html#PapageorgiouDKP06 Harris Papageorgiou Prokopis Prokopidis Athanassios Protopapas George Carayannis Multimedia Indexing and Retrieval Using Natural Language, Speech and Image Processing Methods. 279-297 2005 Multimedia Content and the Semantic Web https://doi.org/10.1002/0470012617.ch11 books/wi/05/SK2005 db/books/collections/SK2005.html#PapageorgiouPPC05 Stelios Piperidis Iason Demiros Prokopis Prokopidis Peter Vanroose Anja Höthker Walter Daelemans Elsa Sklavounou Manos Konstantinou Yannis Karavidas Multimodal, Multilingual Resources in the Subtitling Process. 2004 LREC http://www.lrec-conf.org/proceedings/lrec2004/summaries/680.htm conf/lrec/2004 db/conf/lrec/lrec2004.html#PiperidisDPVHDSKK04 Harris Papageorgiou Prokopis Prokopidis Iason Demiros Nikos Hatzigeorgiou George Carayannis CIMWOS: A Multimedia Retrieval System based on Combined Text, Speech and Image Processing. 38-51 2004 RIAO conf/riao/2004 db/conf/riao/riao2004.html#PapageorgiouPDHC04 https://dl.acm.org/doi/10.5555/2816272.2816277 Harris Papageorgiou Prokopis Prokopidis Voula Giouli Iason Demiros Alexis Konstantinidis Stelios Piperidis Multi-level XML-based Corpus Annotation. 2002 LREC http://www.lrec-conf.org/proceedings/lrec2002/sumarios/159.htm conf/lrec/2002 db/conf/lrec/lrec2002.html#PapageorgiouPGDKP02 Sotiris Boutsis Prokopis Prokopidis Voula Giouli Stelios Piperidis A Robust Parser for Unrestricted Greek Text. 2000 LREC http://www.lrec-conf.org/proceedings/lrec2000/html/summary/174.htm conf/lrec/2000 db/conf/lrec/lrec2000.html#BoutsisPGP00 Harris Papageorgiou Prokopis Prokopidis Voula Giouli Stelios Piperidis A Unified POS Tagging Architecture and its Application to Greek. 2000 LREC http://www.lrec-conf.org/proceedings/lrec2000/html/summary/181.htm conf/lrec/2000 db/conf/lrec/lrec2000.html#PapageorgiouPGP00 Eneko Agirre Iñaki AlegriaIñaki Alegría Loinaz Victoria Arranz Núria Bel Aivars Berzins Sotiris Boutsis George Carayannis Francisco Casacuberta Alexandru Ceausu Khalid Choukri Walter Daelemans Thierry Declerck Miltos Deligiannis Iason Demiros Elina Desipri Miguel Domingo Miquel Esplà-Gomis Corina Forascu Mikel L. Forcada Pamela Forner Mercedes García-Martínez Josef van Genabith Maria Giagkou Voula Giouli Nikos Hatzigeorgiou Manuel Herranz Anja Höthker Guillaume Jacquet Yannis Karavidas Vassia Karra Athanasios Katsamanis Vassilis Katsouros Filip Klubicka Alexis Konstantinidis Manos Konstantinou Maria Koutsombogera Nikola Ljubesic Andrea Lösch Valérie Mapelli Nicolas Moreau Sergio Ortiz-Rojas Petya Osenova Harris PapageorgiouHaris Papageorgiou Aggeliki Papagianopoulou Vassilis Papavasileiou Vassilis Papavassiliou Georgios Paraskevopoulos Pavel Pecina Anselmo Peñas Stelios Piperidis Flammie A. Pirinen Vassilis P. Plagianakos Kanella Pouli Athanassios Protopapas Gema Ramírez-Sánchez Paulo Rocha 0001 Dimitrios RoussisDimitris Roussis Raphaël RubinoRaphael Rubino Bogdan Sacaleanu Marwa Hadj Salah Erik F. Tjong Kim Sang Eileen Schnur Elsa Sklavounou Sokratis Sofianopoulos Richard F. E. Sutcliffe Ales Tamchyna Gregor Thurmair Antonio Toral Peter Vanroose Andrejs Vasiljevs Leon Voukoutis Andy Way Ryder Wishart