1. From digital earth to digital stratum—a new idea in the development of geotechnical engineering;Hehua;Geotechnical Engineering World,1998
2. Zhang Xianlin. 3D digital ground information management system design;Hehua;Geotechnical Engineer,2002
3. Concept of digitization of underground engineering and its preliminary application;Li;Chinese Journal of Rock Mechanics and Engineering,2006
4. Digital underground space and engineering;Hehua;Chinese Journal of Rock Mechanics and Engineering,2007
5. Research on the mine in the 21st century: digital mine;Lixin;Journal of China Coal Society,2000