1. Flexible endoscopy in primary dye testing of the lacrimal system;Becker;Ophthalmic Surg,1990
2. Nasal endoscopy in dye testing after dacryocystorhinostomy;Becker;Ophthalmic Plast Reconstr Surg,1990
3. Balloon catheter dilatation in lacrimal surgery;Becker;Ophthalmic Surg,1989
4. Balloon catheter dilatation for treatment of congenital nasolacrimal duct obstruction;Becker;Am J Ophthalmol,1996
5. Endoskopie der nase als hilfe fur die tranenwegschirurgie;Bosshard;Klin Monatsbl Augenheilkd,1982