1. Allington HV: Liquid nitrogen in the treatment of skin disorders. Calif Med 72: 153, 1960
2. Beard C, Sullivan JH: Cryosurgery of eyelid disorders including malignant tumors. In Zacarian SA (ed): Cryosurgical Advances in Dermatology and Tumors of the Head and Neck, Springfield, I11, Thomas, 1977
3. Brodthagen H: Local freezing of the skin by carbon dioxide snow. Acta Derm Venereol (Stockh) 41 (Suppl 44): 9, 1961
4. Cahan WG: Cryosurgery of malignant and benign tumors. Fed Proc 24: S241, 1965
5. Cooper IS: Cryogenic surgery of basal ganglia. JAMA 181: 600, 1962