Marc Fontaine Stefan Burkhardt Juha Kärkkäinen Bdd-based analysis of gapped q-gram Filters. 1121-1134 2005 16 Int. J. Found. Comput. Sci. 6 http://dx.doi.org/10.1142/S0129054105003698 db/journals/ijfcs/ijfcs16.html#FontaineBK05