IVNICKIJ, A. On the non-stationary distribution of the length of the queue of the single server system. Lithuanian Mathematical Journal, [S. l.], v. 9, n. 2, p. 281–290, 1969. DOI: 10.15388/LMJ.1969.20755. Disponível em: https://www.journals.vu.lt/LMJ/article/view/20755.. Acesso em: 2 may. 2024.