1. Duplication of the primitive hindgut of the human being;Beach;Surgery,1961
2. Seltene Anomalie der Urogenital Organe; Doppelter Penis;Bruni;Ztscher f Urol,1927
3. Operative correction of caudal duplication (dipygus);Rowe;Surgery,1968
4. Duplication of the anus and genitourinary tract;Smith;Surgery,1969