6Wacksman J. Use of the Hodgson XX(modified Asopa) procedure to correct hypospadias with chordee:surgical technique and results. J Urol, 1986, 136:1264-1265.
7Barroso U Jr, Jednak R, Spencer Barthold J, et al. Further experience with the double onlay preputial flap for hypospadias repair. J Urol, 2000, 164: 998-1001.
8Wiener JS,Sutherland RW, Roth DR, et al. Comparison of onlay and tubularized island flaps of inner preputial skin for the repair of proximalhypospadias. J Urol, 1997, 158:1172 -1174.
9Marzouk E. Fistula advancement operation in the treatment of selected cases of persistently recurrent urethrocutaneous fistula following distal penile hypospadias repair. Int J Urol, 1999, 6:135-138.