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Ivan G. Binev; Yuri I. Binev; Bistra A. Stamboliyska; Ivan N. Juchnovski. (1997). IR spectra and structure of benzylidenemalononitrile and its cyanide, methoxide and heptylamine adducts: experimental and ab initio studies. , 435(3), 235–245. doi:10.1016/s0022-2860(97)00193-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research