Oliver Scheuer Bruce M. McLaren Frank Loll Niels Pinkwart An Analysis and Feedback Infrastructure for Argumentation Learning Systems. 629-631 2009 AIED http://dx.doi.org/10.3233/978-1-60750-028-5-629 conf/aied/2009 db/conf/aied/aied2009.html#ScheuerMLP09