Maciej Drozdowski Pawel Marciniak Grzegorz Pawlak Maciej Plaza Grid Branch-and-Bound for Permutation Flowshop. 21-30 2011 PPAM (2) https://doi.org/10.1007/978-3-642-31500-8_3 conf/ppam/2011-2 db/conf/ppam/ppam2011-2.html#DrozdowskiMPP11