1] Plamen Tsankov Study of the Temperature Coefficients of Amorphous and Polycrystalline Silicon Photovoltaic Modules Under Real Operating Conditions" - Contemporary Materials 2015 - Savremeni Materijali, 16.07.2015.
(https://ekonferencije.com/en/paper/study-of-the-temperature-coeff/4056)

2] Plamen Tsankov Analysis of the Production of Electric Energy from Grid Connected Photovoltaic System at Technical University of Gabrovo" - Contemporary Materials 2015 - Savremeni Materijali, 16.07.2015.
(https://ekonferencije.com/en/paper/analysis-of-the-production-of-/4055)