1. Azreg-Aïnou, M.: Quadratic superconducting cosmic strings revisited. Europhys. Lett., 81, article 60003 (2008).
2. Azreg-Aïnou, M., Clément, G.: Kaluza–Klein and Gauss–Bonnet cosmic strings. Class. Quantum Grav., 13, 2635–2650 (1996).
3. Lancaster, P., Tismenetsky, M.: The Theory of Matrices with Applications, Academic Press, Orlando, FL (1985).
4. Lee, H.C. (ed.): An Introduction to Kaluza-Klein Theories, World Scientific, Singapore (1984).
5. Lovelock, D.: The Einstein tensor and its generalizations. J. Math. Phys., 12, 498–501 (1971).