Julio Cesar Sampaio do Prado Leite Jorge Horacio Doorn Graciela D. S. Hadad Gladys N. Kaplan 1-21 2005 10 Requir. Eng. 1 http://www.springerlink.com/index/10.1007/s00766-003-0186-9 db/journals/re/re10.html#LeiteDHK05