1. Farlow, S.J., 1982. Partial Differential Equations for Scientists and Engineers, Dover Publications.
2. Özisik, M.N., 1968. Boundary Value Problems of Heat Conduction, Dover Publications.
3. Mehling, H., L. Cabeza, S. Hiebler, and S. Hippeli, 2002. Improvement of stratified hot water heat stores using a PCM-module, EuroSun Bologna, Proceedings, June 2002.
4. Mehling, H., L.F. Cabeza, S. Hippeli, and S. Hiebler, 2003. PCM-module to improve hot water heat stores with stratification, Renewable Energy, 28, 699–711.
5. Dincer, I., and M.A. Rosen, 2002. Thermal Energy Storage Systems and Applications, John Wiley & Sons, Ltd., London.