BOCA, Florin. Completely positive maps on amalgamated product $C^*$-algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 72, p. 212–222, 1993. DOI: 10.7146/math.scand.a-12445. Disponível em: https://tidsskrift.dk/math/article/view/12445. Acesso em: 13 aug. 2026.