Wojciech Fraczak Wojciech Rytter Mohammadreza Yazdani Matching Integer Intervals by Minimal Sets of Binary Words with don't cares. 217-229 2008 CPM http://dx.doi.org/10.1007/978-3-540-69068-9_21 conf/cpm/2008 db/conf/cpm/cpm2008.html#FraczakRY08