1. Nasal passages;Freeman,1991
2. Endoscopic findings in the upper respiratory tract of 479 horses;Raphel;JAVMA,1982
3. Unilateral choanal atresia in a foal;Hogan;JAVMA,1995
4. Congenital diseases of the equine head;Gaughan;Vet Clin North Am Equine Pract,1993
5. Bilateral hypoplasia of the soft palate and aryepiglottic entrapment in a horse;Bertone;JAVMA,1986