Reference:

Jussi T. Eronen, M. Fortelius, F.T. Portmann, K. Puolamäki, and Christine M. Janis. Neogene aridification of the Northern Hemisphere. Geology, page G33147.1, 2012.

Suggested BibTeX entry:

@article{Eronen12Geology,
    author = {Jussi T. Eronen and M. Fortelius and F.T. Portmann and K. Puolam\"aki and Christine M. Janis},
    journal = {Geology},
    pages = {G33147.1},
    title = {Neogene Aridification of the {N}orthern {H}emisphere},
    year = {2012},
}