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Mary D. Salter Ainsworth and Silvia M. Bell. (1970). Attachment, Exploration, and Separation: Illustrated by the Behavior of One-Year-Olds in a Strange Situation. Child Development, 41(1), 49–67. doi:10.2307/1127388 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research