1. Hehl, F.W., McCrea, J.D., Mielke, E.W., Ne’eman, Y.: Phys. Rep. 258, 1 (1995). arxiv:gr-gc/9402012
2. Capozziello, S., De Laurentis, M.: Int. J. Geom. Meth. Mod. Phys. 6, 1 (2009)
3. Capozziello, S., De Laurentis, M.: Found. Phys. 40, 867 (2010)
4. Schouten, J.A.: Ricci-Calculus, 2nd edn. Springer, Berlin (1954)
5. Kobayashi, S., Nomizu, K.: Foundations of Differential Geometry, vol. I. Interscience Publishers, London (1963)