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Meleis, Afaf Ibrahim; Sawyer, Linda M.; Im, Eun-Ok; Hilfinger Messias, DeAnne K.; Schumacher, Karen . (2000). Experiencing Transitions: An Emerging Middle-Range Theory. Advances in Nursing Science, 23(1), 12–28. doi:10.1097/00012272-200009000-00006 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research