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Pressman, Robert M.; Sugarman, David B.; Nemon, Melissa L.; Desjarlais, Jennifer; Owens, Judith A.; Schettini-Evans, Allison . (2015). Homework and Family Stress: With Consideration of Parents’ Self Confidence, Educational Level, and Cultural Background. The American Journal of Family Therapy, 43(4), 297–313. doi:10.1080/01926187.2015.1061407 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research