1. Nonneoplastic sterile nodules;Frank,2003
2. Fitzpatrick's dermatology in general medicine VI;Freedberg,2003
3. Cutaneous markers of disorders affecting adult horses;Peterson;Clin Tech Equine Pract,2005
4. Disorders of the skin;Rees,2004
5. Cutaneous manifestations of systemic disease;Schott,2009