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Higgins, Patricia Grant; Clough, Dorothy Hendel; Frank, Betsy; Wallerstedt, Cheryl . (1995). Changes in Health Behaviors Made by Pregnant Substance Users. Substance Use & Misuse, 30(10), 1323–1333. doi:10.3109/10826089509105137 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research