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Journal Article Two-stage Procedure For the Quantitative Determination of Prothrombin Concentration Get access Arnold G. Ware, Ph. D. , Arnold G. Ware, Ph. D. From the Department of Physiology and Pharmacology, Wayne University College of Medicine, Detroit, Michigan Search for other works by this author on: Oxford Academic Google Scholar Walter H. Seegers, Ph. D. Walter H. Seegers, Ph. D. From the Department of Physiology and Pharmacology, Wayne University College of Medicine, Detroit, Michigan Search for other works by this author on: Oxford Academic Google Scholar American Journal of Clinical Pathology, Volume 19, Issue 5ₜs, May 1949, Pages 471–482, https: //doi. org/10. 1093/ajcp/19. 5ₜs. 471 Published: 01 May 1949 Article history Received: 31 December 1948 Published: 01 May 1949
Ware et al. (1949) studied this question.