Li, Yan Department Artifacts, Action, Knowledge, Max Planck Institute for the History of Science, Max Planck Society;
http://kns.cnki.net/kcms/detail/detail.aspx?filename=CCRN201803006&dbcode=CJFQ&dbname=CJFDTEMP&v= (Zusammenfassung)
LI_YAN_2018.pdf (beliebiger Volltext), 4MB
Li, Y., Zhang, Y., Li, Z., & Xu, L. (2018). 明长城防御体系整体性保护策略. Zhong guo wen hua yi chan 中国文化遗产 [China Cultural Heritage], 85(3), 48-54.