Brocklehurst, Neil O. Day, Michael S. Rubidge, Bruce Fröbisch, Jörg Supplementary data from Olson's Extinction and the latitudinal biodiversity gradient of tetrapods in the Permian Specimen counts and localities of all for included formations, and diversity estimates. Tetrapoda;Olson's Extinction;Permian;latitudinal biodiversity gradient;sampling bias 2017-04-13
    https://rs.figshare.com/articles/dataset/Supplementary_data_from_Olson_s_Extinction_and_the_latitudinal_biodiversity_gradient_of_tetrapods_in_the_Permian/4873163
10.6084/m9.figshare.4873163.v1