Zachary Dodds Ran Libeskind-Hadas Christine Alvarado Geoff Kuenning Evaluating a breadth-first cs 1 for scientists. 266-270 2008 SIGCSE http://doi.acm.org/10.1145/1352135.1352229 conf/sigcse/2008 db/conf/sigcse/sigcse2008.html#DoddsLAK08