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Antonio Barrozo Budes, Farid; Valencia Ochoa, Guillermo; Obregon, Luis Guillermo; Arango-Manrique, Adriana; Ricardo Núñez Álvarez, José . (2020). Energy, Economic, and Environmental Evaluation of a Proposed Solar-Wind Power On-grid System Using HOMER Pro®: A Case Study in Colombia. Energies, 13(7), 1662–. doi:10.3390/en13071662 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research