Li, Y., & Liu, X. (2021). Sketch Based Thangka Image Retrieval. 2066-2070. https://doi.org/10.1109/IAEAC50856.2021.9390657 Y. Li X. LiuIntangible cultural heritages Deep learning Learning technology Tibetans United Nations Image retrieval Thangka Content recognition Deep Learing Image data Image retrieval Matching rules On-machines Sketch