1. D. D. Ivanenko, P. I. Pronin, and G. A. Sardanashvili, The Gauge Theory of Gravitation [in Russian], Izd. MGU, Moscow (1985).
2. V. N. Ponomarev, Some Aspects of the Theory of Gravitation With Torsion [in Russian], Izd. MGU, Moscow (1974).
3. V. Krechet in: Aspects of the Theory of Gravitation and Elementary Particles [in Russian], Issue 8, Atomizdat, Moscow (1977).