JANÍČEK, František - PONIČAN, Ján - SADLOŇ, Matej. Modified discounted payback period of various small-scale photovoltaic installations. In Elektroenergetika 2019 [elektronický zdroj] : 10th International scientific symposium on electrical power engineering. Stará Lesná, Slovak Republic. September 16-18, 2019. Košice : Technical University of Košice, 2019, S. 468-473. ISBN 978-80-553-3324-3. E*e-604/2019