Wang, Yi; Notaro, Michael; Liu, Zhengyu; Gallimore, Robert; Levis, Samuel & Kutzbach, John E. Detecting vegetation-precipitation feedbacks in mid-Holocene North Africa from two climate models, article, March 31, 2008; (https://digital.library.unt.edu/ark:/67531/metadc896302/m1/1/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .