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Tünnermann, Andreas; Liu, Zejin; Wang, Pu; Tang, Chun; Zheng, Yijun; Tan, Rongqing . (2013). SPIE Proceedings [SPIE ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging - Beijing, China (Tuesday 25 June 2013)] International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications - A four kHz repetition rate compact TEA CO <sub/>2</sub> laser. , 8904(), 89040H–. doi:10.1117/12.2032767 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research