Analysis and optimal control policy N* for Geo^{lambda_1, lambda_2}/Geo/1(MWV) queueing system with negative customers and N-policy
PAN Quyu, TANG Yinghui, LAN Shaojun
Operations Research Transactions . 2017, (3): 65 -76 .  DOI: 10.15960/j.cnki.issn.1007-6093.2017.03.007