W. Kazakos, A. Schmidt, and H. Paoli. Sustainability in the Information Society - 15th International Symposium
Informatics for Environmental Protection, page 513-520. Marburg, Metropolis, (2001)
A. Valikov, W. Kazakos, and A. Schmidt. International Symposium on Systems Integration, page VII-1-VII-8. Baden-Baden, Germany, The Internation Institute for Advanced Studies in Systems Research
and Cybernetics, (2001)