Madsen O., Scally M., Douady C.J., Kao D.J., DeBry R.W., Adkins R., Amrine H.M., Stanhope M.J., de Jong W.W. , Springer M.S., Parallel adaptive radiations in two major clades of placental mammals, in Nature 2001 409:610-614. [1].
Arnason U, et al., Mammalian mitogenomic relationships and the root of the eutherian tree., in Proceedings of the National Academy of Science 2002; 99: 8151-8156. [2].