1. Die leilungsanasthesia am kopf des hundes. Dis Zurich 1948;Barth,1970
2. Orbital pneumography;Bertelsen;Acta Radiol.,1957
3. Veterinary Radiology;Carlson,1977
4. Canine orbital venography;Dixon;J. Am. Vet. Radiol. Soc.,1972
5. Principles of Veterinary Radiology;Douglas,1971