@article{Zhang2011,
author = {Zhang, D.D. and Lee, H.F. and Wang, C. and Li, B. and Pei, Q. and Zhang, J. and An, Y.},
title= {The causality analysis of climate change and large-scale human crisis},
year = {2011},
doi = {10.1073/pnas.1104268108},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
volume = {108},
number = {42},
pages = {17296−17301},
}