1. Morris, D. The Cat Breeds of the World. A Complete Illustrated Encyclopedia (Viking Penguin, 1999).
2. Wastlhuber, J. History of domestic cats and cat breeds. In Feline Husbandry (ed. Pederson, N. C.) 1–59 (American Veterinary Publications INC, 1991).
3. Malik, R., Sparkes, A. & Bessant, C. Brachycephalia—A bastardisation of what makes cats special. J. Feline Med. Surg. 11, 889–890 (2009).
4. Gunn-Moore, D., Bessant, C. & Malik, R. Breed-related disorders of cats. J. Small Anim. Pract. 49, 167–168 (2008).
5. Sieslack, J. Untersuchung über die Auswirkungen des zunehmenden Grads der Brachyzephalie auf den Gesichtsschädel bei Perserkatzen. Doctoral thesis, Justus Liebig University Giessen, Germany (2019).