@article{Wang2016, author = "Siyuan Wang and Bojuan Yang and Qichun Yang and Linlin Lu and Xiaoyue Wang and Yaoyao Peng", title = "{Spatial distribution of the changes in dates of BGS, EGS, LGS and PGS over the past three decades in the Northern Hemisphere.}", year = "2016", month = "6", url = "https://plos.figshare.com/articles/figure/Spatial_distribution_of_the_changes_in_dates_of_BGS_EGS_LGS_and_PGS_over_the_past_three_decades_in_the_Northern_Hemisphere_/3430010", doi = "10.1371/journal.pone.0157134.g004" }