Rukzio, E. , Prezerakos, G. , Cortese, G. , Koutsoloukas, E. , Kapellaki, S. (2007). 'Context for Simplicity: A Basis for Context-aware Systems Based on the 3GPP Generic User Profile '. World Academy of Science, Engineering and Technology, Open Science Index 1, International Journal of Computer and Information Engineering, 1(1), 250 - 253.