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Balghouthi, Moncef; Ali, Abdessalem Bel Hadj; Trabelsi, Seif Eddine; Guizani, Amenallah . (2014). Optical and thermal evaluations of a medium temperature parabolic trough solar collector used in a cooling installation. Energy Conversion and Management, 86(), 1134–1146. doi:10.1016/j.enconman.2014.06.095 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research