@incollection{,
	
					
					
					67A4B45AA67E35CF8EE67EDDBCCAE428
				,
	author={{IbrahimBedane} and {Madda Walabu university  Ethiopia}},
	journal={{Global Journal of Researches in Engineering}},
	journal={{GJRE}}2249-45960975-586110.34257/gjre,
	address={Cambridge, United States},
	publisher={Global Journals Organisation}1722735
}

@book{b0,
	
	
		,
	title={{Time varing multiserver queues with abandonment and retrials}}
		,
	author={{
			WAMandelbaum
		} and {
			MIMassey
		} and {
			RReiman
		} and {
			Rider
		}}
		
		
		
		,
	editor={P. Key and D}
		
	

}

@book{b1,
	
	
		,
	author={{
			Smith
		}}
		,
	title={{Proceedings of the 16th International Teletraffic Conference}}
				the 16th International Teletraffic Conference
		
			,
	year={1999}
		
	

}

@book{b2,
	
	
		,
	title={{Queue lengths and waiting times for multiserver queues with abandonment and retrials}}
		,
	author={{
			AMandelbaum
		} and {
			WAMassey
		} and {
			MIReiman
		} and {
			RRider
		} and {
			AStoylar
		}}
		
		
		
		
		
			,
	year={2000}
		
	
	,
	note={Working paper}

}

@incollection{b3,
	
	
		,
	title={{The multiclass gi/ph/n queue in the halfin whitt regime}}
		,
	author={{
			AAPuhalskii
		} and {
			MIReiman
		}}
		
	
	
		,
	booktitle={{Advences in applied probability}}
				
			,
	year={2000}
			32
			
		
	

}

@incollection{b4,
	
	
		,
	title={{Application of Queueing Theory to Waiting Time of Out-Customers in Hospitals}}
		,
	author={{
			.R AAdeleke
		} and {
			ODOgunwale
		} and {
			OHalid
		}}
		
		
	
	
		,
	journal={{Pacific Journal of Science and Technology}}
		
			10
			2
			
			,
	year={2009}
		
	

}

@book{b5,
	
	
		,
	title={{A Thesis Submitted To School Of Graduate Studies Of Addis Ababa University In Partial Fulfillment For Degree Of Masters Of Science In Industrial System}}
		,
	author={{
			IbrahimBedane
		}}
		
			,
	year={2013}
			
		
	
	,
	note={Lean Principle Implementation In Service Organization With Focus On Ethiopian Health Care Facilities}

}

@incollection{b6,
	
	
		,
	title={{Optimal prediction of queue lengths and delays in gi/m/m multiserver queues}}
		,
	author={{
			CMWoodside
		} and {
			DAStanford
		} and {
			BPagurek
		}}
		
		
	
	
		,
	journal={{Operations Research}}
		
	

}

@book{b7,
	
	
		,
	title={{Call Center Management on Fast Forward: Succeeding in Today's Dynamic Inbound Environment}}
		,
	author={{
			BCleveland
		} and {
			JMayben
		}}
		
		
			,
	year={1999}
			,
	publisher={Call Center Press}
		
	

}

@incollection{b8,
	
	
		,
	title={{Mathematical modelling and simulation for planning critical care capacity}}
		,
	author={{
			AXCosta
		} and {
			SARidley
		} and {
			AKShahani
		} and {
			PRHarper
		} and {
			DeSenna
		} and {
			VNielsen
		} and {
			MS
		}}
		
		
		
		
		
		
	
	
		,
	journal={{Anaesthesia}}
		
			58
			
			,
	year={2003}
		
	

}

@incollection{b9,
	
	
		,
	title={{How long should a customer wait for service}}
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	author={{
			MDavis
		}}
	
	
		,
	booktitle={{Decision Sciences}}
				
			,
	year={1991}
			22
			
		
	

}

@incollection{b10,
	
	
		,
	title={{Queueing Models for Healthcare Operations}}
		,
	author={{
			DiwakarGupta
		}}
	
	
		,
	booktitle={{Handbook of Healthcare Operations Management: Methods and Applications, International Series in Operations Research & Management Science}}
				,
	editor={
			BTDenton
		}
		New York
		
			,
	publisher={Springer Science+Business Media}
			,
	year={2013}
			
		
	

}

@incollection{b11,
	
	
		,
	title={{Modeling Hospital Triage Queuing System}}
		,
	author={{
			IbrahimBedane
		}}
	
	
		,
	journal={{Global Journals Inc}}
		
			2017
			,
	publisher={US}
		
	

}

@incollection{b12,
	
	
		,
	title={{Reduction of Waiting Time by Using Simulation & Queuing Analysi}}
		,
	author={{
			IshanPLade
		} and {
			VPSakhare
		} and {
			MSShelke
		} and {
			PBSawaitul
		}}
		
		
		
	
	
		,
	journal={{International Journal on Recent and Innovation Trends in Computing and Communication}}
		
			
			,
	year={February 2015}
		
	

}

@incollection{b13,
	
	
		,
	title={{A simulation approach: improving Customer waiting time for multiphase Customer flow of obstetrics and gynecology department (O&G Department) in local specialist centre}}
		,
	author={{
			AFNajmuddin
		} and {
			IMIbrahim
		} and {
			SRIsmail
		}}
		
		
	
	
		,
	journal={{WSEAS}}
		
			9
			10
			
			,
	year={2010}
		
	

}

@book{b14,
	
	
		,
	title={{Predicting Waiting Times in Telephone Service Systems}}
		,
	author={{
			ENakibly
		}}
		
			,
	year={2002. July}
		
	
	,
	note={Research Thesis}
	,
	note={Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Science in Operations Research and Systems Analysis}

}

@book{b15,
	
	
		,
	title={{Explicit steady-state solutions in stochastic models: An algorithmic approach}}
		,
	author={{
			MFNeuts
		}}
		
			,
	year={1981}
			,
	publisher={The Johns Hopkins University Press}
			,
	address={Baltimore}
		
	

}

@book{b16,
	
	
		,
	title={{An introduction to skills-based routing and its operational compelxities. Teaching-note}}
		,
	author={{
			OGarnett
		} and {
			AMandelbaum
		}}
		
		
			,
	year={2000}
		
		
			Service Engineering, Technion, Israel
		
	

}

@incollection{b17,
	
	
		,
	title={{Queueing Analysis of Customer Flow in Hospital}}
		,
	author={{
			SOlorunsola
		} and {
			RAdeleke
		} and {
			OOgunlade
		} and {
			T
		}}
		
		
		
	
	
		,
	journal={{IOSR Journal of Mathematics (IOSR-JM}}
		
			
			,
	year={2014}
		
	

}

@book{b18,
	
	
		,
	title={{Waiting time distributions in the accumulating priority queue. Queueing Systems}}
		,
	author={{
			DAStanford
		} and {
			PTaylor
		} and {
			IZiedins
		}}
		
		
		
			2013
			
		
	

}

@incollection{b19,
	
	
		,
	title={{Waiting for service: the relationship between delays and evaluation of service}}
		,
	author={{
			TaylorS
		}}
	
	
		,
	journal={{Journal of Marketing}}
		
			58
			
			,
	year={1994}
		
	

}

@incollection{b20,
	
	
		,
	title={{Partitioning customers into service groups}}
		,
	author={{
			WWhitt
		}}
	
	
		,
	journal={{Management Science}}
		
			45
			11
			
			,
	year={1999}
		
	

}

@incollection{b21,
	
	
		,
	title={{Improving service by informing customers about anticipated delays}}
		,
	author={{
			WWhitt
		}}
	
	
		,
	booktitle={{Management Science}}
				
			,
	year={1999}
			
		
	

}

@incollection{b22,
	
	
		,
	title={{J (1987) queueing models for hospital waiting list}}
		,
	author={{
			DWorthington
		}}
	
	
		,
	booktitle={{The journal of the operational research Society}}
				
			38
			
		
	

}

@book{b23,
	
	
		,
	title={{The psychology of waiting lines}}
		,
	author={{
			DMaister
		}}
		,
	editor={I. J. editor}
		
			,
	year={1985}
			,
	publisher={Lexington Books}
		
	
	,
	note={The Service Encounter}

}