1-ZACHARIN, R.F. Pulsion Enterocele: Review of functional anatomy of the pelvic floor. Obstet. Gynec., 1980, v.55, p. 135-140.

2- GOSLING, J.A.; DIXON, J.S.; CRITCHLEY, H.O.D. et al. A comparative study of the human external sphincter and periurethral levator ani muscles. Brit. J. Urol.,1981, 53: 35.

3- DELANCEY, J.O.L. Strutural aspects of the extrinsic continence mechanism. Obstet. Gynecol.,1988, 72: 296.

4- KEGEL A.H. Progressive resistance exercise in the functional restoration of the muscles. Am. J. Obstet. Ginecol., 1948, v.56, p.238-49.

5- STREINER, D.L., NORMAN, G.R. Bioestatistics: The base essentials St. Louis: Mosby- Year book, 1994,260p.

6- GOODMAN. L.A. Simultaneous confidence intervals for contrasts among multinomial populations. Ann. Mathematical Statistics, 1964, v.35 (2), p. 716-25.

7- GOODMAN. L.A. Simultaneous confidence intervals for multinomiais proportions. Thecnometrics, 1965, v.7 (2), p. 247-54.