Gomes Amaral, P., Coeli de Farias Sales, G., Lima dos Santos, R., Barboza Lopes Magalhães, D. and Santos Gusmão, E. 2011. INFLUENCE OF THE PRESENCE OF CALCIUM IN BLEACHING AGENTS AND THEIR RELATION TO THE MICROHARDNESS OF HUMAN ENAMEL. Revista Brasileira de Ciências da Saúde. 14, 2 (Jan. 2011), 37–44.