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Laatikainen, T.; Peltonen, J. . (1975). FOETAL AND MATERNAL PLASMA LEVELS OF STEROID SULPHATES IN HUMAN PREGNANCY AT TERM. European Journal of Endocrinology, 79(3), 577–588. doi:10.1530/acta.0.0790577 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research