1. Yang J., (2020) Analysis of Applicable Technology Types in Passive Solar Heating Areas. D. Xian, Xi'an University of Architecture and Technology.
2. Wang M., (2017) Suitability Analysis of Auxiliary Heat Sources for Solar Heating in Northwest Rural Areas. D. Xian, Xi'an University of Architecture and Technology.
3. Yin B., Zhang T., Zhang C.G., Dai J.P., Li I.T. (2020) Technical and Economical Research on Clean Heating in Northern Rural Areas. J.