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A.S. Kuar; B. Doloi; B. Bhattacharyya. (2006). Modelling and analysis of pulsed Nd:YAG laser machining characteristics during micro-drilling of zirconia (ZrO2). , 46(12-13), 1301–1310. doi:10.1016/j.ijmachtools.2005.10.016 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research