AIKAWA, Tetsuya. 3-dimensional cohomology of the mod $p$ Steenrod algebra. Mathematica Scandinavica, Berkeley, CA, United States, v. 47, p. 91–115, 1980. DOI: 10.7146/math.scand.a-11876. Disponível em: https://journals.msp.org/mscand/article/view/1766. Acesso em: 25 jul. 2026.