1. GUO Tian-xiang, New Concept MCS-51 C language Course, PUBLISHING HOUSE of ELECTRONICS INDUSTRY, (2009).
2. LI Guo-bin, CUI Hong. LI Yang, Discussion on several problems during implementing warm heating meterage, SHANXI ARCHITECTURE, Taiyuan, 2007, 33(21), PP: 185-186.
3. LI Rui, HAO Xue-jun, GUO Quan YANG Hui, The Situation of charging per heat in European countries and some relative thinking, CHINA HOUSING FACILITIES, 2004, (5), PP: 15-18.
4. LIN Ze, HAO Bin, QI Ren-guang, The Comparison of indoor heat metering methods and the research on economic benefit, DISTRICT HEATING, 2009, (6), PP: 37-42.
5. TU Feng-xiang, XU Zong-wei, WANG You-lan and FANG Xiu-mu. Report of residential heat metering and charging situation in Poland and Denmark, HEATING, VENTILATING & AIR CONDITIONING, 2000, 30(1), PP: 25-28.