1. Hypospadias with special reference to etiology;Sorenson;Op. Dom. Biol. Hered. Hum.,1953
2. Study of the incidence of hypospadias in Rochester, Minnesota, 1940-1970, and a case-control comparison of possible etiologic factors;Sweet;Mayo Clin. Proc.,1974
3. The incidence of hypospadias in Sweden;Avellan;Scand. J. Plast. Reconstr. Surg.,1975
4. Normal and anomalous development of the urinary tract;Maizels,1998