Wang Yao Gokhan Sahin Mengke Li Byrav Ramamurthy Analysis of multi-hop traffic grooming in WDM mesh networks. 64-75 2009 6 Optical Switching and Networking 1 http://dx.doi.org/10.1016/j.osn.2008.09.001 db/journals/osn/osn6.html#YaoSLR09