Geodesic
The problems of applying the mathematical models in national economy (on example of modeling the ages distribution of the engines)
Matematičeskoe modelirovanie, Tome 3 (1991) no. 4, pp. 57-66 
J. N. Grigorov; P. V. Danulov; Yu. N. Pavlovsky. The problems of applying the mathematical models in national economy (on example of modeling the ages distribution of the engines). Matematičeskoe modelirovanie, Tome 3 (1991) no. 4, pp. 57-66. http://geodesic.mathdoc.fr/item/MM_1991_3_4_a6/
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     title = {The problems of applying the mathematical models in national economy (on example of modeling the ages distribution of the engines)},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {57--66},
     year = {1991},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_1991_3_4_a6/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

The mathematical model is introduced, that describes a process of exploring the engines. This model is used to illustrate the problems of applying the mathematical modeling in designing, planning, control and managment.