Timothy Meekhof Terence Soule Robert B. Heckendorn Improving Markov chain classification using string transformations and evolutionary search. 1259-1266 2009 GECCO http://doi.acm.org/10.1145/1569901.1570070 conf/gecco/2009g db/conf/gecco/gecco2009.html#MeekhofSH09