Danielian, E. A., and Kh. Z. Khachikyan. “TENDENCIES OF THE Mr|Gr|1|∞ MODEL’S STUDY”. Proceedings of the YSU A: Physical and Mathematical Sciences, vol. 35, no. 1 (195), Mar. 2001, pp. 4-22, https://doi.org/10.46991/PYSUA.2001.35.1.004.