Pilar Sala Juan-Pablo Lázaro J. Artur Serrano Katrin Müller Juan-Carlos Naranjo Methods for User Experience Design of AAL Services. 238-247 2009 HCI (6) http://dx.doi.org/10.1007/978-3-642-02710-9_27 conf/hci/2009-6 db/conf/hci/hci2009-6.html#SalaLSMN09