VirtualLength: a new packet scheduling algorithm for proportional delay differentiation. - Jianbin Wei; Qing Li 007; Cheng-Zhong Xu 001 (ICCCN, 2003)

A robust packet scheduling algorithm for proportional delay differentiation services. - Jianbin Wei; Cheng-Zhong Xu 001; Xiaobo Zhou 002; Qing Li 007 (Comput. Commun., 2006)