HÜGLI, R. V. Characterizations of tripotents in JB*-triples. MATHEMATICA SCANDINAVICA, [S. l.], v. 99, n. 1, p. 147–160, 2006. DOI: 10.7146/math.scand.a-15005. Disponível em: https://www.mscand.dk/article/view/15005. Acesso em: 11 apr. 2025.