Dimitris Bertsimas Guglielmo Lulli Amedeo R. Odoni The Air Traffic Flow Management Problem: An Integer Optimization Approach. 34-46 2008 IPCO http://dx.doi.org/10.1007/978-3-540-68891-4_3 conf/ipco/2008 db/conf/ipco/ipco2008.html#BertsimasLO08