WINSKEL, G. On the compositional checking of validity. DAIMI Report Series, [S. l.], v. 19, n. 324, 1990. DOI: 10.7146/dpb.v19i324.6714. Disponível em: https://tidsskrift.dk/daimipb/article/view/6714. Acesso em: 8 may. 2024.