Sant’Anna, S. S., D. A. de Souza, C. de F. Carvalho, and M. I. Yoshida. “Morphological and Thermal Analyses of Flexible Polyurethane Foams Containing Commercial Calcium Carbonate”. Eclética Química, vol. 33, no. 2, June 2008, pp. 55-60, doi:10.26850/1678-4618eqj.v33.2.2008.p55-60.