1. Energy visions 2030 for Finland. VTT Energy, Finland: Edita Helsinki, 2001. ISBN-951-37-3596-6.
2. Cogeneration;Hu David,1985
3. Materials for an exploratory theory of the network society;Castells;British Journal of Sociology,2000
4. Patterns of metropolitan development: what have we learned?;Ingram;Urban Studies,1998
5. Energy in Finland 2002. Statistics Finland, Finland: Painojussit Oy Kerava, 2003. ISBN 952-467-245-6 (available at: http://www.stat.fi/tk/yr/energfin.pdf).