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2. A study of the effects of high doses of vitamin A on oral leukoplakias (hyperkeratosis) including toxicity, liver function and skeletal metabolism;Silverman;J Oral Ther Pharmacol,1965
3. Klinische Erfahrungen mit Vitamin-A-Säure-Derivaten bei der Behandlung von Leukoplakien der Mundschleimhaut;Koch;Dtsch Zahnärztl Zschr,1972
4. Snuff dippers keratosis (snuff-induced leukoplakia);Raque;South J Med,1975
5. Biochemical treatment of precancerous oral lesions: The effectiveness of various analogous of retinoic acid;Koch;J Maxillofac Surg,1978