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Rudolf Burcl; Nicholas C Handy; Stuart Carter. (2003). Vibrational spectra of furan, pyrrole, and thiophene from a density functional theory anharmonic force field. , 59(8), 1881–1893. doi:10.1016/s1386-1425(02)00421-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research