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Fairbanks, Lynn A.. (1996). [Advances in the Study of Behavior] Parental Care: Evolution, Mechanisms, and Adaptive Significance Volume 25 || Individual Differences in Maternal Style. , (), 579–611. doi:10.1016/s0065-3454(08)60343-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research