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Nagle, Ray B.; Mcdaniel, Kathleen M.; Clark, Virginia A.; Payne, Claire M. . (1983). The Use of Antikeratin Antibodies in the Diagnosis of Human Neoplasms. American Journal of Clinical Pathology, 79(4), 458–466. doi:10.1093/ajcp/79.4.458 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research