Alem, Lala Maghnia, 		Boualem, Mohamed, AND 		Aissani, Djamil.
"Bounds of the stationary distribution in  M/G/1 retrial queue with two way communication and n types of outgoing calls                                                            ation and n type of outgoing call" <em>Yugoslav Journal of Operations Research</em> [Online], Volume 29 Number 3 (13 May 2019)