Miller, W.D.: Micro-organisms of Human Mouth, Philadelphia, 1890, The S. S. White Dental Mfg. Co., p. 364.
2.
Orban, B., and Weinmann, J.P.: The Cellular Elements of the Saliva and Their Possible Role in Caries, J. A. D. A.26. 2008, 1939.
3.
Papanicolaou, G.N., and Traut, H.F.: Diagnosis of Uterine Cancer by the Vaginal Smear, New York, 1943, Commonwealth Fund, p. 46.
4.
Weinmann, J.P. : The Keratinization of the Human Oral Mucosa , J. D. Res. 19: 57, 1940.
5.
Ziskin, D.E., Kamen, P., and Kittay, I.: Epithelial Smears of the Oral Mucosa, J. D. Res. 20: 386, 1941.
6.
Ziskin, D.E., Kamen, P., and Kittay, I.: Comparison of Oral and Vaginal Smears in Women with Certain Gynecological Disorders, J. D. Res. 21: 341, 1942.