Mikko-Jussi Laakso Erkki Kaila Teemu Rajala Tapio Salakoski Define and Visualize Your First Programming Language. 324-326 2008 ICALT http://dx.doi.org/10.1109/ICALT.2008.313 conf/icalt/2008 db/conf/icalt/icalt2008.html#LaaksoKRS08