1. Li ZX (1994a) Study on reinforcement of weathered sandstone sculptures by PS-C. In: Li Zui-xiong’s collections on conservation of grottoes. Gansu Nationalities Press, Lanzhou
2. Li ZX (1994b) Study on crack grouting to conglomerate rock mass of the grottoes by PS-C. In: LI Zui-xiong’s collections on conservation of grottoes. Gansu Nationalities Press, Lanzhou
3. Li XY (2000) Experimental study on rainfall harvesting and microcatchment model for ecosystem construction in the transitional zone between semiarid and arid region. PhD, Cold and Arid Regions Environment and Engineering Research Institute of the Chinese Academy of Sciences, Lanzhou
4. Li BCh (2004) Discussion on Holocene palaeoclimate environment in the ruins of Banpo in Xi′an. J Northwest Univ (Natural Science Edition) 34(4):485–488
5. Li ZX (2008) Conservation of ancient sites on the Silk Road. Science Press, Beijing