1. Cooper, Z. K.: A study of 106 cases of multiple primary skin cancer. Surg. Clin. N. Amer. Oct., 1022 (1944).
2. Phillips, Charles: Multiple skin cancer: A statistical and pathologic study. Sth. med. J. (Bgham, Ala.) 35, 583 (1942).
3. Cooper, Z. K.: A study of 106 cases of multiple primary skin cancer. Surg. Clin. N. Amer. Oct., 1022 (1944).
4. MacDonald, Eleanor J.: Occurrence of multiple primary cancers in a population of 200,000. Acta Un. int. Cancr. 16, 1702 (1960).
5. Molesworth, E.H.: Rodent ulcer. Med. J. Aust. 1, 878 (1927).