3Lee JM, Song HY, Han YM, et al . Balloon dacryocystoplasty : results in the treatment of complete and partial obstruction of the nasolaerimal system. Radiology 1994 ; 192 ( 2 ) : 503-508.
4Munk PL, Lin DT, Morris DC. Epiphora: treatment by means ofdacryoeystoplasty with balloon dilation of the nasolacrimal drainage apparatus. Radiology 1990 ; 177 ( 3 ) :687-690.
5Zwaan J . Treatment of congenital nasolacrimal duct obstruction before and after the age of 1 year. Ophthalmic Surglasers 1997; 28 ( 11 ) : 932-936.
6Song HY, Jin YH, Kim JH, et al. Nonsurgical placement of a nasolacrimal polyurethane stent : long-term effectiveness. Radiology 1996 ; 200(3 ) :759-763.
