Huan bei taipingyang di qu dai zhi bei zhong tan san tan si zhi wu xian dui feng du yu qi hou tiao jian guan xi yan jiu (The relationship between climatic conditions and the relative abundance of modern C3 and C4 plants in three regions around the North

Rao, Z. G., Z. Y. Zhu, G. D. Jia, F. Chen, L. Barton, J. W. Zhang, and M. R. Qiang. 2010. Huan bei taipingyang di qu dai zhi bei zhong tan san tan si zhi wu xian dui feng du yu qi  hou tiao jian guan xi yan jiu (The relationship between climatic conditions and the relative abundance of modern C₃ and C₄ plants in three regions around the North Pacific). Zhongguo Kexue Yuan (Chinese Science Bulletin) 55:1134-1140.