1. Proceedings of the International Conference on Subsurface Heat Storage in Theory and Practice, Swedish Council for Building Research,1983
2. Proceedings of the 3rd International Conference, ENERSTOCK 85,1985
3. Proceedings of the Workshop on Solar-assisted Heat Pumps with Ground Coupled Storage,1982
4. Proceedings of the Second Workshop on Solar-assisted Heat Pumps with Ground Coupled Storage,1985
5. Underground long-term storage of solar energy—An Overview;Givoni;Solar Energy,1977