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Bryan L. Spangelo; Philip C. Ross; Allan M. Judd; Robert M. MacLeod. (1989). Thymic stromal elements contain an anterior pituitary hormone-stimulating activity. , 25(1), 37–46. doi:10.1016/0165-5728(89)90084-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research