WEIER, Josef. Lorentzmetrik in der Algebra der komplexen 4-Matrizen. Mathematica Scandinavica, Berkeley, CA, United States, v. 14, p. 120–128, 1964. DOI: 10.7146/math.scand.a-10712. Disponível em: https://journals.msp.org/mscand/article/view/2590. Acesso em: 25 jul. 2026.