Chubaryan, E. V., et al. “UNIVERSE EVOLUTION IN THE EINSTEIN FRAME OF JORDAN–BRANS–DICKE THEORY”. Proceedings of the YSU A: Physical and Mathematical Sciences, vol. 44, no. 2 (222), Apr. 2010, pp. 49-54, https://doi.org/10.46991/PYSUA.2010.44.2.049.