POPEYE: providing collaborative services for ad hoc and spontaneous communities. - Juan A. Botía Blaya; Isabelle M. Demeure; Paolo Gianrossi; Pedro García López; Juan Antonio Martínez Navarro; Eike Michael Meyer; Patrizio Pelliccione; Frédérique Tastet-Cherel (Serv. Oriented Comput. Appl., 2009)