Angelo Oddi Amedeo Cesta Nicola Policella Stephen F. Smith Hybrid Variants for Iterative Flattening Search. 355-360 2008 CPAIOR http://dx.doi.org/10.1007/978-3-540-68155-7_37 conf/cpaior/2008 db/conf/cpaior/cpaior2008.html#OddiCPS08