1. Abroshimov, N.V., Aseev, V.V.: Generalizations of Casey’s theorem for higher dimensions. Lobachevskii J. Math. 39, 1–12 (2018)
2. Abrosimov, N.V., Mikaiylova, L.A.: Casey’s theorem in hyperbolic geometry. Sib. Èlektron. Mat. Izv. 12, 354–360 (2015)
3. Berger, M.: Geometry I. Springer, Berlin (1987)
4. Blumenthal, L.: Theory and Applications of Distance Geometry. Clarendon Press, Oxford (1953)
5. Bottema, O.: Topics in Elementary Geometry, 2nd edn, translated from the 1987 Dutch edition by Reinie Erné. Springer, New York (2008)