1. Butlin, H. T.: Diseases of the Tongue. London, Cassell & Co., 1900. Cited by Prinz and Greenbaum.3
2. LEUCOPLAKIA BUCCALIS AND ORAL EPITHELIAL NAEVI. A CLINICAL AND HISTOLOGIOAL STUDY.*
3. Prinz, H. and Greenbaum, G. G.: Diseases of the Mouth and Their Treatment. Ed. 2, rev. Philadelphia, Lea & Febiger, 1939, p. 246.
4. THE PATHOLOGIC CHANGES RESULTING FROM VITAMIN DEFICIENCY