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N.A Novikov; A.P Mozoleva; A.V Uvarov; S.G Alekseyeva; I.Ya Slonim. (1986). Analysis of the 13C and 1H NMR spectra of phenol-formaldehyde resole oligomers. , 28(5), 0–1196. doi:10.1016/0032-3950(86)90270-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research