POGORZELSKI, H. A. Skolem Arithmetics on Certain Concrete Word Systems. MATHEMATICA SCANDINAVICA, [S. l.], v. 14, p. 93–105, 1964. DOI: 10.7146/math.scand.a-10709. Disponível em: https://www.mscand.dk/article/view/10709. Acesso em: 28 apr. 2024.