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Ranson, Kenna E.; Urichuk, Liana J. . (2008). The effect of parent–child attachment relationships on child biopsychosocial outcomes: a review. Early Child Development and Care, 178(2), 129–152. doi:10.1080/03004430600685282 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research