1. Congenital patent urachus and acquired variants;Blichert-Toft;Acta Chir Scand,1971
2. Patent persistent urachus associated with urolithiasis in a cat;Greene;J Am Vet Med Assoc,1971
3. Patent urachus in a cat;Hansen;Vet Med Small Anim Clin,1972
4. Persistent urachal ligament in the cat;Hansen;Vet Med Small Anim Clin,1972
5. Urachal remnant in the cat: Occurrence and relationship to the feline urological syndrome;Hansen;Vet Med Small Anim Clin,1977