Alberto Apostolico Cinzia Pizzi On the Monotonicity of the String Correction Factor for Words with Mismatches. 2006 Combinatorial and Algorithmic Foundations of Pattern and Association Discovery http://drops.dagstuhl.de/opus/volltexte/2006/789 conf/dagstuhl/2006P6201 db/conf/dagstuhl/P6201.html#ApostolicoP06