Harri Hämäläinen Jukka Tarkkonen Kari Heikkinen Jouni Ikonen Jari Porras Use of Peer-Review System for Enhancing Learning of Programming. 658-660 2009 ICALT http://dx.doi.org/10.1109/ICALT.2009.195 conf/icalt/2009 db/conf/icalt/icalt2009.html#HamalainenTHIP09