Ana Paula Ambrosio Charles Almeida Fábio M. Costa Halley Gondim Lucas Luiz Provensi Luciana Oliveira Digital Ink as a Collaborative Learning Support. 309-314 2009 CSEDU (1) conf/csedu/2009-1 db/conf/csedu/csedu2009-1.html#AmbrosioACGPO09