KOWYNIA, J. The unicity of best approximation in a space of compact operators. MATHEMATICA SCANDINAVICA, [S. l.], v. 108, n. 1, p. 146–160, 2011. DOI: 10.7146/math.scand.a-15164. Disponível em: https://www.mscand.dk/article/view/15164. Acesso em: 29 apr. 2024.