BUSEMANN, Herbert. Remark on "Planes with analogues to Eucledian angular bisectors". Mathematica Scandinavica, Berkeley, CA, United States, v. 38, p. 81–82, 1976. DOI: 10.7146/math.scand.a-11618. Disponível em: https://journals.msp.org/mscand/article/view/2029. Acesso em: 25 jul. 2026.