Liu, R.-C.R.-C.LiuSHENG-DE WANG2020-06-042020-06-041991https://scholars.lib.ntu.edu.tw/handle/123456789/497307Modeling and Performance Analysis of Two Phase Service Systemsjournal article10.1080/02533839.1991.96773332-s2.0-0026152714https://www.scopus.com/inward/record.uri?eid=2-s2.0-0026152714&doi=10.1080%2f02533839.1991.9677333&partnerID=40&md5=45397ed1276e905ac13e3b7aa571ad87