/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: joaoabrao1 https://cdn.slidesharecdn.com/profile-photo-joaoabrao1-48x48.jpg?cb=1711455167 Sou professor universitário. Trabalho na USP-Ribeirao Preto.