1. Alcaraz, A., Vinaixa, F., Tejedo-Mateu, A. et al. (1991) Obstruction and recanalitation of the ureter during embryonic development. J. Urol. 145, 410–416.
2. Antonakopoulos, G.N., Fuggle, W.J., Newman, J. et al. (1985) Idiopathic hydronephrosis. Arch. Pathol. Lab. Med. 109, 1097–1101.
3. Hinman, F. (1995) Atlante di anatomia chirurgica in urologia. Roma, Verduci Editore
4. Kaneto, H., Orikasa, S., Chiba, T. et al. (1991) Three-D muscular arrangement at the ureteropelvic junction and its changes in congenital hydronephrosis. A stereo-morphometric study. J. Urol. 146, 909–914.
5. Maizels, M., Stephens, F.D. (1980) Valves of the ureter as a cause of primary obstruction of the ureter: anatomic, embryologic and clinical aspects. J. Urol. 123, 742–747.