NIELSEN, Mogens; ROZENBERG, Grzegorz; THIAGARAJAN, P. S. Elementary transition systems. DAIMI Report Series, [S. l.], v. 19, n. 310, 1990. DOI: 10.7146/dpb.v19i310.6701. Disponível em: https://tidsskrift.dk/daimipb/article/view/6701. Acesso em: 11 dec. 2025.