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McClelland, Megan M.; Cameron, Claire E.; Connor, Carol McDonald; Farris, Carrie L.; Jewkes, Abigail M.; Morrison, Frederick J. . (2007). Links between behavioral regulation and preschoolers' literacy, vocabulary, and math skills.. Developmental Psychology, 43(4), 947–959. doi:10.1037/0012-1649.43.4.947 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research