B. Sun, D. L. Dilcher, D. J. Beerling, C. Zhang, D. Yan, E. Kowalski,
Variation in Ginkgo biloba L. leaf characters across a climatic gradient in China Proceedings of the National Academy of Sciences of the United States of America. ,vol. 100, pp. 7141- 7146 ,(2003) ,
10.1073/PNAS.1232419100