Leonor Becerra-Bonache Colin de la Higuera Jean-Christophe Janodet Frédéric Tantini Learning Balls of Strings with Correction Queries. 18-29 2007 conf/ecml/2007 ECML http://dx.doi.org/10.1007/978-3-540-74958-5_6 db/conf/ecml/ecml2007.html#Becerra-BonacheHJT07