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Abreau, Kerstin; Callan, Christine; Kottaiyan, Ranjini; Zhang, Aizhong; Yoon, Geunyoung; Aquavella, James V.; Zavislan, James; Hindman, Holly B. . (2016). Temperatures of the Ocular Surface, Lid, and Periorbital Regions of Sjögren's, Evaporative, and Aqueous-Deficient Dry Eyes Relative to Normals. The Ocular Surface, 14(1), 64–73. doi:10.1016/j.jtos.2015.09.001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research