COOPER: Towards a Collaborative Open Environment of Project-Centred Learning. - Aldo Bongio; Jan van Bruggen; Stefano Ceri; Valentin Cristea; Peter Dolog; Andreas Hoffmann; Maristella Matera; Marzia Mura; Antonio Vincenzo Taddeo; Xuan Zhou 001; Larissa Zoni (EC-TEL, 2006)