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Schweitzer, A.; Schiel, W.; Birkle, M.; Nava, P.; Riffelmann, K.-J.; Wohlfahrt, A.; Kuhlmann, G. . (2014). ULTIMATE TROUGH® - Fabrication, Erection and Commissioning of the World's Largest Parabolic Trough Collector. Energy Procedia, 49(), 1848–1857. doi:10.1016/j.egypro.2014.03.196 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research