Hend S. Al-Khalifa Henda Chorfi Afnan A. Al-Subaihin Amal Al-Ibrahim Maha M. Al-Yahya Incorporating the Prisoners' Dilemma in Peer-Assessment: An Experimental Study. 317-319 2011 ICALT http://dx.doi.org/10.1109/ICALT.2011.99 conf/icalt/2011 db/conf/icalt/icalt2011.html#Al-KhalifaCAAA11