ผู้เขียน: M. rcia Federson

Everaldo M. Bonotto, Ph D, is Associate Professor in the Department of -Applied Mathematics and Statistics, at ICMC-Universidade de São Paulo, São Carlos, SP, Brazil. Márcia Federson, Ph D, is Full Professor in the Department of Mathematics at ICMC-Universidade de São Paulo, São Carlos, SP, Brazil. Jaqueline G. Mesquita, Ph D, is Assistant Professor at Department of Mathematics at the University of Brasília, Brasília, DF, Brazil.