1. Posterior urethra;Kaplan,1976
2. Anomalies of the urethra;Duckett,1979
3. Editorial comments to Kurth K-H, Alleman ERJ, Schröder FH: Major and minor complications of posterior urethral valves;Duckett;J Urol,1981
4. Disorders of the urethra and penis;Duckett,1986
5. Posterior urethral valves in boys. A broad clinical spectrum;Hendren;J Urol,1971