Traffic congestion is observed around shopping malls. mostly. due to the long queue at the parking entry gates. The queuing theory is an operation research technique that mathematically models the queuing systems consisting of randomly arriving costumers to receive service and then depart such as the parking entry gates. https://olivebookmarks.com/story19598924/epidemiological-aspects-and-differential-diagnosis-of-the-cutaneous-round-cell-tumors-in-dogs