1. Agency of Natural Resources and Energy, 2002. The Statistics of Comprehensive Energy, Tsusyosangyosya Corp. EERE, U.S. Department of energy 2005. Available from: .
2. Arzano, L., Goswami, D.Y., 1997. Performance analysis of a closed loop underground air tunnel for residential housing in a hot and humid climate. In: Proceedings of ISES 1997 Solar World congress, vol. 4, pp. 239–251.
3. Thermal behavior in a cooling tube system with natural ventilation;Azumi;Journal of AIJ (Environ.),2001
4. Numerical simulation, technical and economic evaluation of air-to-earth heat exchanger coupled to a building;Bojic;Energy,1997
5. Thermal-hydraulic design of earth–air heat exchangers;De Paepe;Energy and Buildings,2003