1. Calamkaryan AA, Abramov AA. Clinical variants of necrobiosis lipoidica. In the book Modern methods of diagnostics ant treatment of dermatosis. М., 1984; 41-44. (In Russ)
2. Urbach, 1932 cit. Lever UF. Skin histopathology. М.:1958; 289-291. (In Russ)
3. Tsvetkova GM, Mordovtsev VN. Necrobiosis lipoidica. In the book: Pathomorphological diagnostics of skin diseases. M.: Medicine.1986:133-135. (In Russ)
4. Shaposhnikov OK, Khazizov IE. Modern aspects of pathogenesis and therapy of annual granuloma and Necrobiosis lipoidica. Bull dermatol venereal. 1985; 5: 4-8. (In Russ)
5. Wee SA, Possick P. Necrobiosislipoidica. Dermatol. Online J. 9. 2004; 30: 18.