@article{KUIPM_1979_a12,
     author = {E. A. Begovatov and A. V. Lapin},
     title = {Diffusion approximation in closed queueing systems},
     journal = {Issledovaniya po Prikladnoi Matematike i Informatike},
     pages = {95--102},
     publisher = {mathdoc},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUIPM_1979_a12/}
}