Arunabha Sen Sudheendra Murthy Subir Bandyopadhyay On Sparse Placement of Regenerator Nodes in Translucent Optical Network. 2675-2680 2008 GLOBECOM http://dx.doi.org/10.1109/GLOCOM.2008.ECP.513 conf/globecom/2008 db/conf/globecom/globecom2008.html#SenMB08