HelwigE. B.:
Inverted follicular keratosisin Seminars on the Skin: Neoplasms and Dermatoses. Proc 20th Seminar, Am Soc Clinical Pathologists,
p. 38,
Chicago,
1955
LeverW. F.Schaumburg-LeverG.:
Histopathology of the Skin,
p. 458;
J. B. Lippincott,
Philadelphia,
1975
4.
HeadingtonJ. T.:
Tumors of the hair follicle; a review.Am J Pathol85:
480–514,
1976
5.
StannardA. A.PulleyL. T.:
Tumors of the skin and soft tissuesinTumors in Domestic Animals,
ed. Moulton;
pp. 38–42,
2nd ed.,
University of California Press,
Berkeley,
1978
6.
WeissE.FreseK.:
VII. Tumors of the skin.Bull WHO50:
79–100,
1974
