Broderick Crawford Carlos Castro Eric Monfroy Claudio Cubillos Decomposition Approach to Solve Dial-a-Ride Problems Using Ant Computing and Constraint Programming. 448-457 2007 conf/bvai/2007 BVAI http://dx.doi.org/10.1007/978-3-540-75555-5_43 db/conf/bvai/bvai2007.html#CrawfordCMC07