Anía B, Suman V, Sobell J, Codd M, Silverstein M, Melton L. (1994). «Trends in the incidence of polycythemia vera among Olmsted County, Minnesota residents, 1935-1989» Am J Hematol 47 (2): 89–93. doi:10.1002/ajh.2830470205. PMID8092146..
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Anía B, Suman V, Sobell J, Codd M, Silverstein M, Melton L. (1994). «Trends in the incidence of polycythemia vera among Olmsted County, Minnesota residents, 1935-1989» Am J Hematol 47 (2): 89–93. doi:10.1002/ajh.2830470205. PMID8092146..