Marcelo Pimenta and Carlos Heuser. 1991.
 Canonicus: Um modelo para portabilidade de programas interativos. In <em>Proceedings of the 5th Brazilian Symposium on Software Engineering</em>, October 23, 1991, Ouro Preto/MG, Brasil. SBC, Porto Alegre, Brasil, 119-133. DOI: <a href="https://doi.org/10.5753/sbes.1991.24262">https://doi.org/10.5753/sbes.1991.24262</a>.