1. Biological production and therapeutic use of ammonia in the oral cavity in relation to dental caries prevention;Kesel;J.A.D.A,1946
2. Caries control by chemical prophylaxis;Henschel;New York J. Den,1946
3. Chemical study of human saliva indicating that ammonia is an immunizing factor in dental caries;Grove;J.A.D.A,1935
4. Ammonia content of the mouth;Ludwick;J. D. Res,1950
5. Salivary ammonia and its relation to dental caries;Youngburg;J. D. Res,1936