SANDGREN, Lennart. A correction to "On convex cones". Mathematica Scandinavica, Berkeley, CA, United States, v. 3, p. 170–170, 1955. DOI: 10.7146/math.scand.a-10437. Disponível em: https://journals.msp.org/mscand/article/view/2885. Acesso em: 8 sep. 2026.