BUSEMANN, H. Planes with analogues to Euclidean angular bisectors. MATHEMATICA SCANDINAVICA, [S. l.], v. 36, p. 5–11, 1975. DOI: 10.7146/math.scand.a-11556. Disponível em: https://www.mscand.dk/article/view/11556. Acesso em: 5 may. 2024.