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Kyriakos D. Papadopoulos; Angel G. Guzmán-Garcia; Raymond V. Bailey. (1990). The response of straight and circular fins to fluid temperature changes. , 17(5), 587–595. doi:10.1016/0735-1933(90)90007-7 

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