Determination the optimal tilt and azimuth angle of photovoltaic system for maximum energy in Bucharest region, Romania - Case StudyMihaela Andreea Mitiu, Marius Viorel Olteanu, Gyorgy Deak, Natalia Simona Raischi and Danut CociorvaE3S Web Conf., 80 (2019) 01007DOI: https://doi.org/10.1051/e3sconf/20198001007