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Díez-Mediavilla, M.; Dieste-Velasco, M.I.; Rodríguez-Amigo, M.C.; García-Calderón, T.; Alonso-Tristán, C. . (2014). Performance of grid-tied PV facilities based on real data in Spain: Central inverter versus string system. Energy Conversion and Management, 86(), 1128–1133. doi:10.1016/j.enconman.2014.06.087 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research