1. The origin of salivary calculus;Prinz;Dent Cosmos,1921
2. The association between supragingival calculus deposits and the extent of gingival recession in a sample of Thai children and teenagers;Rustogi;J Clin Dent (Suppl B),1991
3. The effect of an anticalculus dentifrice on calculus formation and gingival recession in Thai children and teenagers: one year study. Study no. 2—an anticalculus dentifrice containing 1.3 percent soluble pyrophosphate and 1.5 percent of a copolymer;Rustogi;J Clin Dent (Suppl B);,1991
4. Calculus revisited: a review;Mandel;J Clin Periodontal,1986