Fisher, Ronald Aylmer, Sir, 1890-19622006-11-162006-11-161939Annals of Eugenics, 9: 174-180 (1939)http://hdl.handle.net/2440/15235Reproduced with permission of Cambridge University Press871545 bytesapplication/pdfen162: The Comparison of Samples with Possibly Unequal Variances.Journal article