Golubovska E., Citkuseva Dimitrovska B., and Golubovski R. “ANALYTICAL ESTIMATION OF THE OPTIMAL PV PANEL TILT BASED ON A CLEAR-SKY IRRADIANCE MODEL”. Journal of Energy Technology, Vol. 16, no. 4, Mar. 2025, pp. 41-53, doi:10.18690/jet.16.4.41-53.2023.