Jürgen Börstler Nauman Bin Ali Kai Petersen Double-counting in software engineering tertiary studies - An overlooked threat to validity. 107174 2023 June 158 Inf. Softw. Technol. https://doi.org/10.1016/j.infsof.2023.107174 db/journals/infsof/infsof158.html#BorstlerAP23