A. A. Ghukasian and V. V. Hayrapetian, “ON ONE ALGORITHM OF APPROXIMATE CONTROL OF FLEXIBLESYSTEMS”, Proc. YSU A: Phys. Math. Sci., vol. 36, no. 2 (198), pp. 51–57, Jul. 2002, doi: 10.46991/PYSUA.2002.36.2.051.