Kate Sanders Jonas Boustedt Anna Eckerdal Robert McCartney Jan Erik Moström Lynda Thomas Carol Zander Student understanding of object-oriented programming as expressed in concept maps. 332-336 2008 SIGCSE http://doi.acm.org/10.1145/1352135.1352251 conf/sigcse/2008 db/conf/sigcse/sigcse2008.html#SandersBEMMTZ08