1. Eurostat: ECHP UDB manual. European Community Household Panel Longitudinal Users’ Database. Technical report, Eurostat, Luxembourg (July 2004)
2. Goulding, M.R.: Public health and aging: Trends in aging — United States and worldwide (morbidity and mortality weekly report). Technical report, Centers for Disease Control and Prevention (2003)
3. De Florio, V., Blondia, C.: On the requirements of new software development. International Journal of Business Intelligence and Data Mining 3(3) (2008)
4. Stark, D.C.: Heterarchy: Distributing Authorithy and Organizing Diversity. In: Clippinger III, J.H. (ed.) The Biology of Business: Decoding the Natural Laws of Enterprise, pp. 153–179. Jossey-Bass, San Francisco (1999)
5. Holland, J.H.: Hidden Order: How Adaptation Builds Complexity. Addison-Wesley, Reading (1995)