Danielyan, E. A., and V. K. Saghatelyan. “ON ONE MINIMAX PROBLEM ON THE CLASS OF DISTRIBUTION FUNCTIONS INCREASING HAZARD RATE”. Proceedings of the YSU A: Physical and Mathematical Sciences, vol. 39, no. 3 (208), Oct. 2005, pp. 53-57, doi:10.46991/PYSU:A/2005.39.3.053.