1. S. Kakac, E. Paykong and Y. Yener, Storage of solar thermal energy, NATO ASI Ser.; Ser. E, 1989, p. 167.
2. S. Kranse and R. Tamme, J. Solar Eng., 226 (108) 1986.
3. Lao Yunliang and Shen Zhongnan, Weapons Industry J., 21 (1983) 4 (China).
4. Zhang Xiaodi, Appl. Regres. Anal., Zhejiang University Publishing House (China).