https://biz.heraldcorp.com/article/3822670
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https://www.economist.com/finance-and-economics/2015/08/06/the-dreamboat-next-door
The dreamboat next door_The Economist_AEJ_2015.pdf
Hill, Andrew J. 2015. "The Girl Next Door: The Effect of Opposite Gender Friends on High School Achievement." American Economic Journal: Applied Economics 7 (3): 147–77**.**