OKAYASU, Rui; OZAWA, Narutaka; TOMATSU, Reiji. Haagerup approximation property via bimodules. Mathematica Scandinavica, Berkeley, CA, United States, v. 121, n. 1, p. 75–91, 2017. DOI: 10.7146/math.scand.a-25970. Disponível em: https://journals.msp.org/mscand/article/view/314. Acesso em: 24 jul. 2026.