BUSEMANN, Herbert. 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://tidsskrift.dk/math/article/view/11556. Acesso em: 14 aug. 2026.