1. Experimental study on thermal core type ground thermal energy storage using a heat pump;Nakajima,1983
2. Study on effective utilization of ground heat storage system (Part 1–3);Nakajima,1987
3. Investigation analysis on thermal properties of soil as heat storage media (Part 1–6);Nakajima,1983
4. Study on thermal properties of soil relation with passage of time;Nakajima,1986
5. Study on seasonal ground heat storage of solar energy using a vertical pipe system (Part 1);Ochifuji,1985