00388nas a2200145   4500000000100000008004100001260004700042100001800089700002000107700001800127245006100145300001200206490000600218020001800224       2001                            d  bIEEE Computer SocietyaWashington, DC, USA1 aJoan Marquès1 aLeandro Navarro1 aA. Daradoumis00aWWG: a distributed infrastructure for learning in groups  a14–200 v2  a0-7803-6669-7