1. Zhou, Z.-Y & Zhang, B.-L Palaeontographica B 211, 113–133 (1989).
2. Chang, M.-M, Chen, P.-J, Wang, Y.-Q & Wang, Y. (eds) The Jehol Biota (Shanghai Science & Technology, Shanghai, 2001).
3. Swisher, C. C. III et al. Chinese Sci. Bull. 47, 135–138 (2002).
4. Rothwell, G. W. & Holt, B. in Ginkgo biloba — A Global Treasure from Biology to Medicine (eds Hori, T. et al.) 223–230 (Springer, Tokyo, 1997).
5. Crane, P. R., Manchester, S. R. & Dilcher, D. L. Fieldiana (Geol.) N. Ser. 20, 1–63 (1990).