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Karney, Benjamin R.; Bradbury, Thomas N. . (1995). The longitudinal course of marital quality and stability: A review of theory, methods, and research.. Psychological Bulletin, 118(1), 3–34. doi:10.1037/0033-2909.118.1.3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research