1. A. Tapus, M.J. Matarić, B. Scassellati: The grand challenges in socially assistive robotics, IEEE Robotics Autom. Mag. Spec. Issue Grand Chall. Robotics (2007)
2. United Nations Department of Economic and Social Affairs, Population Division (2011): World Population Aging 1950–2050, http://www.un.org/esa/population/publications/worldageing19502050/ (2013)
3. Department of Health and Human Services, Centers for Disease Control and Prevention (2009)
4. American Psychiatric Association: Diagnostic and Statistical Manual of Mental Disorders: DSM-IV-TR (American Psychiatric Association, Arlington 2000)
5. F.R. Volkmar, C. Lord, A. Bailey, R.T. Schultz, A. Klin: Autism and pervasive developmental disorders, J. Child Psychol. Psychiatry 45(1), 135–170 (2004)