5Premachandra I M, Gonzalez L. Research on bank queuing system and counter setting optimization [ J ]. Journal of Bank- ing & Finance ,2012,32( 1 ) : 126-139.
6Harris J C, Wehlau D L. Non-negative integer linear congru- ences [ J ]. Indagationes Mathematicae ,2006,17 ( 1 ) :37-44.
7Alfa A S, He Qiming. Algorithmic analysis of the discrete time GIX/GY/1 queueing system [ J ]. Performance Evaluation, 2008,65 ( 9 ) : 623 -640.
8Taufemback C, Da Silva S. Queuing theory applied to the opti- mal management of bank excess reserves [ J ]. Physica A : Sta- tistical Mechanics and Its Applications,2012,319(4) :1381- 1387.