Akira Takahashi Yoshitaka Takahashi Shigeru Kaneda Noriteru Shinagawa Diffusion Approximations for the GI/G/c/K queue. 681-686 2007 conf/icccn/2007 ICCCN http://dx.doi.org/10.1109/ICCCN.2007.4317896 db/conf/icccn/icccn2007.html#TakahashiTKS07