Aaqib Patel Md. Zafar Ali Khan S. N. Merchant Uday B. Desai Lajos Hanzo How Many Cognitive Channels Should the Primary User Share? 78-85 2018 25 IEEE Wirel. Commun. 5 https://doi.org/10.1109/MWC.2018.1700382 https://www.wikidata.org/entity/Q62130525 db/journals/wc/wc25.html#PatelKMDH18