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Peterson, Gary L.; Straka, Sharon A. . (2008). SPIE Proceedings [SPIE Optical Engineering + Applications - San Diego, CA (Sunday 10 August 2008)] Optical System Contamination: Effects, Measurements, and Control 2008 - <title>Stray light test station for measuring point source transmission and thermal background of visible and infrared sensors</title>. , 7069(), 70690M–70690M-9. doi:10.1117/12.794898 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research