1. Dalenbäck J. O. (1997) Evaluation of Existing Plants, EU–APAS-Project RENA CT 94-0057, “Large-scale Solar Heating Systems” Steinbeis TZ, Heßbrühlstr. 21 C, D-70565 Stuttgart.
2. Fisch M. N., Pauschinger T. and Köhler F. (1995) Verlag Stiftung Warentest, Berlin Test Solaranlagen, Solarkollektoren und Speicher Heft Test Spezial “Energie and Umwelt”, pp. 62–81.
3. Fisch M.N., Lutz A., Mahler B. and Mangold D. (1996) Comprehensive Energy concepts for new Housing Areas - Solar City Friedrichshafen, Proceedings of the 4th EU conference Solar Energy in Architecture and Urban Planning, Berlin ISBN 9521452-8-6, pp. 83–86.
4. Fisch M. N., Guigas M., Dalenbäck J. O. and Zinko H. (1997) Large-scale Solar Heating Systems - Final Report EU–APAS, Project RENA CT 94-0057 Steinbeis TZ, Heßbrühlstr. 21 C, D-70565 Stuttgart.
5. Fisch M. N., Kübler R., Schulz M.E. and Seiwald H. (1996) Central Solar Heating Plants with Seasonal Storage - The first Pilot Plants in Germany, Proceedings of the 4th EU conference Solar Energy in Architecture and Urban Planning, Berlin, pp. 59–61.