WEIER, Josef. Lorentzmetrik in der Algebra der komplexen 4-Matrizen. MATHEMATICA SCANDINAVICA, [S. l.], v. 14, p. 120–128, 1964. DOI: 10.7146/math.scand.a-10712. Disponível em: https://tidsskrift.dk/math/article/view/10712. Acesso em: 14 aug. 2026.