中国科学院数学与系统科学研究院期刊网
Unified Characteristic Numbers and Solutions of Equations for Birth and Death Processes with Barriers
Xiang-qun Yang, He-song Wang
Acta Mathematicae Applicatae Sinica(English Series) . 2010, (3): 443 -451 .  DOI: 10.1007/s10255-010-0009-y