Springer (August 2004). "Molecules consolidate the placental mammal tree". Trends in Ecology & Evolution. 19 (8): 430-8. doi:10.1016/j.tree.2004.05.006. PMID16701301.
Penny (October 2004). "The rise of birds and mammals: are microevolutionary processes sufficient for macroevolution?". Trends in Ecology & Evolution. 19 (10): 516-522. doi:10.1016/j.tree.2004.07.015. PMID16701316.
Springer (August 2004). "Molecules consolidate the placental mammal tree". Trends in Ecology & Evolution. 19 (8): 430-8. doi:10.1016/j.tree.2004.05.006. PMID16701301.
Penny (October 2004). "The rise of birds and mammals: are microevolutionary processes sufficient for macroevolution?". Trends in Ecology & Evolution. 19 (10): 516-522. doi:10.1016/j.tree.2004.07.015. PMID16701316.