7Wormald PJ,Kew J,Van Hasselt A. Intranasal anatomy of the nasolacrimal sac in endoscopic dacryocystorhinostomy [J]. Otolaryngol Head Neck Surg, 2000,123(3) : 307-310.
8Wormald P J,Kew J,van Hasselt A.Intranasal anatomy of the nasolacrimulsac in endoscopic dacryocystorhinostomy[J].Otolaryngol Head Neck Surg,2000,123 (3):307-310.