Giorgio Ausiello Esteban Feuerstein Stefano Leonardi Leen Stougie Maurizio Talamo Serving Requests with On-line Routing. 37-48 1994 conf/swat/1994 SWAT db/conf/swat/swat94.html#AusielloFLST94 http://dx.doi.org/10.1007/3-540-58218-5_4