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

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