%0 Journal Article %A J. N. Grigorov %A P. V. Danulov %A Yu. N. Pavlovsky %T The problems of applying the mathematical models in national economy (on example of modeling the ages distribution of the engines) %J Matematičeskoe modelirovanie %D 1991 %P 57-66 %V 3 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM_1991_3_4_a6/ %G ru %F MM_1991_3_4_a6