SPARR, G. A new proof of Löwner’s theorem on monotone matrix functions. MATHEMATICA SCANDINAVICA, [S. l.], v. 47, p. 266–274, 1980. DOI: 10.7146/math.scand.a-11889. Disponível em: https://www.mscand.dk/article/view/11889. Acesso em: 29 apr. 2024.