TIKHONENKO, O. Generalized Erlang problem for queueing systems with accumulation. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 3, p. 273–278, 2003. Disponível em: https://studmath.uken.krakow.pl/article/view/13500. Acesso em: 30 oct. 2026.