<p>PhD in Engeneering Production. Especialist in Statistics and Quantitative Modeling. Profesor  in the Universidade Federal de Santa Maria(UFSM). 1000 Roraima Av. Zip 97105-900. Phone: +55553220-8000. Camobi, Santa Maria, Rio Grande do Sul, Brazil.Email: <a href="mailto:lflopes67@yahoo.com.br">lflopes67@yahoo.com.br</a></p>