Ageing in a networked society: social inclusion and mental stimulation. - John A. Waterworth; Soledad Ballesteros; Christian Peter; Gerald Bieber; Andreas Kreiner; Andreas Wiratanaya; Lazaros Polymenakos; Sophia Wanche-Politis; Michele Capobianco; Igone Etxeberria; Louise Lundholm (PETRA, 2009)