JINNAH, M. I. A note on PG-modules. Mathematica Scandinavica, Berkeley, CA, United States, v. 37, p. 27–28, 1975. DOI: 10.7146/math.scand.a-11584. Disponível em: https://journals.msp.org/mscand/article/view/2089. Acesso em: 25 jul. 2026.