[[1] S. Weinberg, Gravitation and Cosmology: Principles and Applications of the General Theory of Relativity (Wiley, New York, 1972).]Search in Google Scholar
[[2] I. I. Cotăescu, Gen. Relativity Gravitation 43, 1639 (2011).10.1007/s10714-011-1145-2]Search in Google Scholar
[[3] N. D. Birrel and P. C. W. Davies, Quantum Fields in Curved Space (Cambridge University Press, Cambridge 1982).10.1017/CBO9780511622632]Search in Google Scholar
[[4] I. I. Cotăescu, J. Phys. A: Math. Gen. 33, 9177 (2000).]Search in Google Scholar
[[5] B. Carter and R. G. McLenaghan, Phys. Rev. D 19, 1093 (1979).10.1103/PhysRevD.19.1093]Search in Google Scholar
[[6] N. A. Chernikov and E. A. Tagirov, Ann. Inst H. Poincaré IX 1147 (1968); P. Candelas and D. J. Raine, Phys. Rev. D 12 965 (1975); J. S. Dowker and J. S. Critchely, Phys. Rev. D 13, 224 (1976); T. S. Bunch and P. C. W. Davies, Proc. R. Soc. Lond. A 360, 117 (1978).]Search in Google Scholar
[[7] I. I. Cotăescu, C. CruceaAn and A. Pop, Int. J. Mod. Phys. A 23, 2463 (2008).10.1142/S0217751X08039487]Search in Google Scholar