Dear colleague, We are organizing the stream on Network Optimization in the EURO 2010 conference in Lisbon (Portugal), July 11-14, 2010 (http://www.euro2010lisbon.org/). We would like to invite you to propose and chair a session with three (or four) papers, or alternatively, to submit an abstract to be included in a session of the cluster. If you want to organize a session, please contact us and we will send you further details. To submit an abstract, just go to http://www.euro-online.org/conf/euro24/ and use invitation code fe402d71. With best regards, Bernard Fortz (bernard.fortz@ulb.ac.be) Luis Gouveia (legouveia@fc.ul.pt)