HÜGLI, Remo V. Characterizations of tripotents in JB*-triples. Mathematica Scandinavica, Berkeley, CA, United States, v. 99, n. 1, p. 147–160, 2006. DOI: 10.7146/math.scand.a-15005. Disponível em: https://journals.msp.org/mscand/article/view/692. Acesso em: 24 jul. 2026.