Gabrielyan, M. S., and A. G. Matevosyan. “MINIMAX AIMING AT SEVERAL TARGET SETS FOR STAGE BY STAGE VARYING PROPER LINEAR STOCHASTIC SYSTEMS”. Proceedings of the YSU A: Physical and Mathematical Sciences, vol. 37, no. 2 (201), June 2003, pp. 25-29, https://doi.org/10.46991/PYSUA.2003.37.2.025.