1. COXETER, H.S.M.: Cubic Curves related to a Quadrangle,C.R.Math. Rep.Acad.Sci. Canada XV (1993), 237 - 242.
2. CUNDY, H.M.: Reflections on reflections,Math.Gaz. 58 (1974), 265 - 272.
3. DEAUX, R.:Introduction to the Geometry of Complex Numbers, F.Ungar, New York, 1956.
4. DEAUX, R.:Mathesis 1959, 228.
5. JOHNSON, R.A.:Advanced Euclidean Geometry, 1929, reprinted Dover 1960.