2) Bouquot, J. E. & Gundlach, K. K. H.: Oral exophytic lesions in 23, 616 white Americans over 35 years of age, Oral Surg. Oral Med. Oral Pathol., 62: 284-291, 1986.
3) Jones, J. H.: Non-odontogenic oral tumors in children, Brit. Dent. J., 119: 439-447, 1965.