Heterogeneous system GI/GI(n)/∞ with random customers capacities / E. Y. Lisovskaya, S. P. Moiseeva, M. Pagano, E. V. Pankratova // Applied probability and stochastic processes. Singapore, 2020. P. 507-521 (Infosys Science Foundation series. Infosys Science Foundation series in mathematical sciences. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/koha:000702736