Tian, N., & Zhang, Z. G. (2006). Vacation Queueing Models Theory and Applications. Springer US. https://doi.org/10.1007/978-0-387-33723-4

Tian, Naishuo, and Zhe George Zhang. Vacation Queueing Models Theory and Applications. Boston, MA: Springer US, 2006. https://doi.org/10.1007/978-0-387-33723-4.

Tian, Naishuo, and Zhe George Zhang. Vacation Queueing Models Theory and Applications. Springer US, 2006. https://doi.org/10.1007/978-0-387-33723-4.