@misc{misca608f413,
title   = {Effect of ultra-sound on the surface hardness of glass-ionomer cements},
author = {Machado, R. P. and Carvalho, C. A. R. and Lauris, José Roberto Pereira and Atta, Maria Teresa and Navarro, Maria Fidela de Lima},
year = {2005},
booktitle   = {General Session & Exhibition of the IADR - International Association for Dental Research}
}