DZINOTYIWEYI, Heneri A. M. Compactness criteria for semigroups, a note on a preceding paper. Mathematica Scandinavica, Berkeley, CA, United States, v. 46, p. 173–176, 1980. DOI: 10.7146/math.scand.a-11860. Disponível em: https://journals.msp.org/mscand/article/view/1784. Acesso em: 25 jul. 2026.