CHRISTENSEN, Erik. The block Schur product is a Hadamard product. Mathematica Scandinavica, Berkeley, CA, United States, v. 126, n. 3, p. 603–616, 2020. DOI: 10.7146/math.scand.a-121069. Disponível em: https://journals.msp.org/mscand/article/view/174. Acesso em: 24 jul. 2026.