1. F. Catoni, D. Boccaletti, R. Cannata, V. Catoni, E. Nichelatti, P. Zampetti, The Mathematics of Minkowski Space–Time (Birkhäuser Verlag, Basel, 2008)
2. F. Catoni, R. Cannata, V. Catoni, P. Zampetti, N-dimensional geometries generated by hypercomplex numbers. Adv. Appl. Clifford Al. 15(1), 1 (2005)
3. C.C. Silva, R. de Andrade Martins, Polar and axial vectors versus quaternions. Am. J. Phys. 70(9), 958 (2002)
4. M. Lavrentiev, B. Chabat, Effets Hydrodynamiques et modèles mathématiques (Mir, Moscou, 1980)
5. I.M. Yaglom, Complex Numbers in Geometry (Academic Press, New York, 1968)