Grupp M., B. Kromer, J. Cieslok, Convective Systems : The Use of Air in Thermosyphonic Flow in Solar Thermal Systems - A New Way Towards Cost-Efficient Appliances, in Advances in Solar Energy Technology, Vol. 2, pp 1086, Pergamon, Sept. 1987.

Grupp M., H. Bergler, D. Smagghe, F. Vidoni, Two Novel Solar Appliances for Developing Countries", 1. Convective Solar Cookers, 2. Solar Medical Sterilizer, in Advances in Solar Energy Technology, Vol. 3, pp 2668, Pergamon, Sept. 1987.

Grupp, M., P. Montagne,and M. Wackernagel, A Novel Advanced Box-Type Solar Cooker, in Solar Energy, Vol. 47, No.2, pp 107-113, 1991.

Grupp, M. et al., New Prospects in Solar Cooking, Study for GATE/GTZ, Eschborn, May 1991

ECSCR (92): Solar Cooker Testing Procedure - Proposal, Eschborn, November 1992

Bergler, H., M. Grupp, Economic Aspects of Solar Cooking in Kenya, Study for the UNICEF Evaluation Office, New York, 1993.

SBCI (93): Pejack, E. (ed.), Advances in Solar Cooking - Proceedings of the First World Conference on Solar Cooking, Stockton, January 1993.

ECSCR (93): Results of the First Comparative Solar Cooker Test in Almeria, Eschborn, August 1993

Grupp, M., Solar Cooking Revisited, in Harmony with Nature, Vol 5, pp 485-489, ed. ISES, 1993

Merkle, T., M. Grupp, M., Sodeik, Klassifizierung von Solarkochersystemen mittels einer unter realen Bedingungen erprobten Testmethode, in 9. Int. Sonnenforum, Band 2, pp 1440-1446, DGS 1994.

Grupp, M., T. Merkle, M. Owen-Jones, Deuxième essai international de cuiseurs solaires, in Systèmes solaires, 104, pp 33-52, 1994.

ECSCR (94): Second International Solar Cooker Test, Summary of Results, Second Edition, Lodève, June 1994

PSA, Synopsis, TDC Serial Report 2/95, Comparative Test of Solar Dryers - Results-, August 1995.

PSA, Synopsis, TDC Serial Report 3/95, Comparative Test of Solar Portables Lanterns - Results-, August 1995.

Grupp, M., A. Neumann, G. Schröder, Comparison of Measures against Deforestation in Selected Regions of Mali - The WOODSIM simulation model -, Study for GTZ, November 1995.

Grupp M., H. Bergler, J.-P. Bertrand, B. Kromer, J. Cieslok, Convective Flat Plate Collectors and their Applications, in Solar Energy, Vol. 55, No.3, pp 195-207, 1995

Balzar R., P. Stumpf, S. Eckhoff, H. Ackermann, M. Grupp, A Solar Cooker Using Vacuum Tube Collectors With Integrated Heat-Pipes, in Solar Energy, Vol. 58, Nos.1-3, pp 63-68, 1996

Grupp, M., E. Biermann, A. Klingshirn, I. Kotze, M. Wentzel, Solar Cooker Field Test in South Africa - Technical Goals. Proceedings EuroSun'96, 10. Internationales Sonnenforum, September 1996.

Biermann, E., M. Grupp, A. Klingshirn, I. Kotze, M. Wentzel, Solar Cooker Field Test in South Africa - Project Outline. Proceedings EuroSun'96, 10. Internationales Sonnenforum, September 1996.

Grupp, M., H. Bergler, G. Schröder, Le séchage solaire au banc d'essai, in Systèmes solaires, 120, pp 29-33, 1997.

Solar Cooker Field Test in South Africa - End-User Acceptance, GTZ/DME, 1997

Grupp, M., H. Bergler, G. Schröder, Neuf lampes solaires au banc d'essai, in Systèmes solaires, 128, pp 41-48, 1998.

Biermann, E, M. Grupp, R. Palmer, Solar Cooker Acceptance in South Africa, in Solar Energy, Vol. 66, No.6, pp 401-407, 1999

Bergler H., E. Biermann, M. Grupp, M. Owen-Jones, Richard Palmer. Moving Ahead with Solar Cookers -Acceptance and Introduction to the Market. GTZ, Eschborn 1999.

Grupp, M., Perception of the Solar Water Heater Market by Professionals and Clients in 4 European Countries, Thermie B, 2000.

Grupp M., E. Biermann, R. Palmer. Solar Cooker Technology Transfer : No Problem ? Actes de "World Solar Cooking And Food Processing", Varese octobre 1999, pp 151-157, FAST, Milan, 2000.

Synopsis, Concept Energie, FHG/ISI, IT Power, TTA, Wagner&Co, Untapped Market Opportunities for Solar Water Heaters in Europe, Vol. 1 and 2, Lodève, décembre 2000.

Synopsis, Concept Energie, FHG/ISI, IT Power, TTA, Wagner&Co, Perception des marchés de chauffe-eau solaires dans quatre pays européens et recommandations pour le développement du marché français, Lodève, décembre 2000.

Grupp M., Solar Cooker Technology Transfer - Lessons from the DME/GTZ Field Test in South Africa, Proceedings "International Conference on Solar Cooking 2000, Kimberley novembre 2000, pp 117 - 122, DME, Pretoria, 2001

Veille technique et réglementaire sur l'intégration de l'énergie solaire dans le secteur du bâtiment, Concept Energie/Synopsis, 2002

Bergler H., Le test de cuiseurs solaires en Afrique du Sud, Proceedings "Encuentro Solar 2002, Benicarló", Fundació Terra, Barcelona, juin 2002.

Bergler H., Solarkocher-Feldtest in Südafrika, Proceedings "Fachtagung Erneuerbare Energien in der Entwicklungszusammenarbeit", Oekozentrum Langenbruck, juin 2002.

Grupp, M and Wentzel, M. 2002. The pros and cons of standards in solar energy appliances - international and local case studies. Paper delivered at the National Standards Conference, 10 October 2002. Pretoria, South Africa.

Solar Cooker Field Test in South Africa - Solar Cooker Compendium, Vol 1-5, GTZ/DME, 2002

Grupp, M., Greenhouse Gas Emissions by Cooking With Different Fuels in Developing and Industrialised Countries, accepté pour Eedal03, 2003

Grupp, M., Les énergies renouvelables dans le transport de voyageurs en France : Analyse des conditions d'une transition vers le 100% renouvelable en 2025 - Premiers résultats du scénario "ULYSSE25"

Grupp, M., Domestic Cooking Appliances in Developing Countries - Economic and Environmental Aspects, Proc. DUE, Capetown 2004

Grupp, M., Hannelore Bergler, Acceptation de cuiseurs solaires, Rencontres cuisson écologique, Nantes 2005

Grupp, M., Vergleich verschiedener Szenarien des Übergangs von fossiler zu erneuerbarer Stromerzeugung in Deutschland, Proc. Weltversammlung für Erneuerbare Energien (WREA), Bonn 2005.

Grupp, M., Energy consumption, saving potential and policies in domestic cooking in Developing Countries, Proc. Conf. Carbon and Cooking, Milano 2006

Grupp, M., Hannelore Bergler, Marlett Wentzel, Discussion of different measures to monitor and boost the use rate of solar cookers in Developing Countries, Proc. Int. Solar Cooker Conf., Granada 2006