@article{KUIPM_1981_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},
     publisher = {mathdoc},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUIPM_1981_a12/}
}