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Käpylä, E; Turunen, S; Pelto, J; Viitanen, J; Kellomäki, M . (2011). Investigation of the optimal processing parameters for picosecond laser-induced microfabrication of a polymer–ceramic hybrid material. Journal of Micromechanics and Microengineering, 21(6), 065033–. doi:10.1088/0960-1317/21/6/065033 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research