@article{KUIPM_1981_9_9_a12,
     author = {E. A. Begovatov and N. P. Evlampiev},
     title = {Diffusion approximation in closed queueing systems},
     journal = {Issledovaniya po Prikladnoi Matematike i Informatike},
     pages = {93--101},
     year = {1981},
     volume = {9},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUIPM_1981_9_9_a12/}
}