Hoppe, Fred M (1984). "Polya-like urns and the Ewens' sampling formula". Journal of Mathematical Biology (באנגלית). 20 (1): 91–94. doi:10.1007/bf00275863. ISSN0303-6812.
worldcat.org
Hoppe, Fred M (1984). "Polya-like urns and the Ewens' sampling formula". Journal of Mathematical Biology (באנגלית). 20 (1): 91–94. doi:10.1007/bf00275863. ISSN0303-6812.