Bininda-Emonds, O. R., et al. (2007) The delayed rise of present-day mammals Nature 446: 507-512
Rolland, J., Condamine, F. L., Jiguet, F., & Morlon, H. (2014) Faster speciation and reduced extinction in the tropics contribute to the mammalian latitudinal diversity gradient. PLoS Biol, 12(1): e1001775.