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Marchenko, D.; Neerincx, A. H.; Mandon, J.; Zhang, J.; Boerkamp, M.; Mink, J.; Cristescu, S. M.; Hekkert, S. te Lintel; Harren, F. J. M. . (2015). A compact laser-based spectrometer for detection of C2H2in exhaled breath and HCN in vitro. Applied Physics B, 118(2), 275–280. doi:10.1007/s00340-014-5983-y 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research