ÉSIK, Z.; LARSEN, K. G. Regular Languages Definable by Lindström Quantifiers (Preliminary Version). BRICS Report Series, [S. l.], v. 9, n. 20, 2002. DOI: 10.7146/brics.v9i20.21950. Disponível em: https://tidsskrift.dk/brics/article/view/21950. Acesso em: 29 nov. 2022.