A Voronoi interior adjacency-based approach for generating a contour tree. - Jun Chen; Chaofei Qiao; Renliang Zhao (Comput. Geosci., 2004)

Applications of GPS-RTK technique in a new digital photogrammetric camera system. - Hongyou Liang; Xingfa Gu; Tao Yu 001; Liuzhao Wang; Chaofei Qiao (IGARSS, 2007)