\input zb-basic
\input zb-ioport
\iteman{io-port 70782646}
\itemau{Ebersp\"acher, Henri; Joab, Michelle}
\itemti{A role-based approach to group support in a collaborative learning environment}
\itemso{ICALT, 64-65 (2005).}
\itemcc{}
\itemut{}
\itemli{http://doi.ieeecomputersociety.org/10.1109/ICALT.2005.21}
\end