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Roisman, Glenn I.; Clausell, Eric; Holland, Ashley; Fortuna, Keren; Elieff, Chryle . (2008). Adult romantic relationships as contexts of human development: A multimethod comparison of same-sex couples with opposite-sex dating, engaged, and married dyads.. Developmental Psychology, 44(1), 91–101. doi:10.1037/0012-1649.44.1.91 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research