Daqing Li
Research Centre of Palaeontology, Bureau of Geology and Resource Exploration of Gansu Province, Lanzhou 730050, Peoples Republic of China.
Peng B. X., Du Y. S. and Li D., 2004, The first discovery of the Early Cretaceous Pterosaur Tracks and its significance in Yanguoxia, Yongjing County, Gasnsu Province. Earth Science Journal of China, University of Geosciences. vol 29, no 1.
Zhang J., Li D., Li M., Lockley M. and Bai Z., 2006, Diverse dinosaur, pterosaur and bird-track assemblages from the Hakou Formation, Lower Cretaceous of Gansu Province, northwest China. Cretaceous Research 27, 44 - 55.