Developing Intelligent Tutoring Systems for Mathematics. - Maria das Graças Volpe Nunes; Ricardo Hasegawa (Comput. Artif. Intell., 1997)

Linguistic issues in the development of ReGra: A grammar checker for Brazilian Portuguese. - Ronaldo Teixeira Martins; Ricardo Hasegawa; Maria das Graças Volpe Nunes; Gisele Montilha; Osvaldo Novais de Oliveira (Nat. Lang. Eng., 1998)

Curupira: A Functional Parser for Brazilian Portuguese. - Ronaldo Teixeira Martins; Graça Nunes; Ricardo Hasegawa (PROPOR, 2003)

Methods and Tools for Encoding the WordNet.Br Sentences, Concept Glosses, and Conceptual-Semantic Relations. - Bento Carlos Dias-da-Silva; Ariani Di Felippo; Ricardo Hasegawa (PROPOR, 2006)