Context Grouping Mechanism for Context Distribution in Ubiquitous Environments. - Manuele Kirsch-Pinheiro; Yves Vanrompay; Koen Victor; Yolande Berbers; Massimo Valla; Cristina Frà; Alessandro Mamelli; Paolo Barone; Xiaoming Hu; Alisa Devlic; G. Panagiotou (OTM Conferences (1), 2008)