HÜGLI, Remo 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://tidsskrift.dk/math/article/view/15005. Acesso em: 14 aug. 2026.