Mariot, Carlos Henrique Paim; Eberhardt, Domingos Savio; Lopes, Mara Cristina Barbosa; Lopes, Sergio Iraçu Grindi; Menezes, Valmir Gaedke; Lopes, Marlene Souza; Macedo, Vera Regina Mussoi; Silva, Paulo Regis Ferreira da(1997)[Abstract published in event]