References
- Magrane W. G. Canine Ophthalmology. Lea & Febiger, Philadelphia (1968); 9–30
- Havener W. H. Ocular PharmacologySecond Edition. C.V. Mosby, St. Louis (1979); 175–180
- Grant W. M. Toxicology of the EyeSecond Edition. C.C. Thomas, Springfield (1974); 819