An<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mfenced separators="|"><mml:mrow><mml:mi>s</mml:mi><mml:mo>,</mml:mo><mml:mi> </mml:mi><mml:mi>S</mml:mi></mml:mrow></mml:mfenced></mml:mrow></mml:math>Production Inventory Controlled Self-Service Queuing System
Journal of probability and statistics