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Kozak, A. O.; Ivashchenko, V. I.; Porada, O. K.; Ivashchenko, L. A.; Sinelnichenko, O. K.; Dub, S. N.; Lytvyn, O. S.; Tymofeeva, I. I.; Tolmacheva, G. N. . (2015). Effect of the nitrogen flow on the properties of Si-C-N amorphous thin films produced by magnetron sputtering. Journal of Superhard Materials, 37(5), 300–309. doi:10.3103/S1063457615050020 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research