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Helena B. Nader; Norman M. McDuffie; Carl P. Dietrich. (1974). Heparin fractionation by electrofocusing: Presence of 21 components of different molecular weights. , 57(2), 488–493. doi:10.1016/0006-291x(74)90958-9 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research