MOSLEHIAN, Mohammad Sal; ZAMANI, Ali. Mappings preserving approximate orthogonality in Hilbert $C^*$-modules. Mathematica Scandinavica, Berkeley, CA, United States, v. 122, n. 2, p. 257–276, 2018. DOI: 10.7146/math.scand.a-102945. Disponível em: https://journals.msp.org/mscand/article/view/279. Acesso em: 24 jul. 2026.