Não informado. (1930). Annals of Mathematical Statistics. Institute of Mathematical Statistics.
Lua i Stíl Chicago (17ú heag.)Não informado. Annals of Mathematical Statistics. Ann Arbor, Mich: Institute of Mathematical Statistics, 1930.
Lua MLA (8ú heag.)Não informado. Annals of Mathematical Statistics. Institute of Mathematical Statistics, 1930.
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