Dataset Open Access
The molecular dataset (NymphalidaeMole.nex) used in the 2009 paper can be found here, as well as the posterior distribution of trees (PRS.trees) and the MCC tree with mean dates for each node (PRS.tre).
Wahlberg, N., Leneveu, J., Kodandaramaiah, U., Peña, C., Nylin, S., Freitas, A. V. L. & Brower, A. V. Z. 2009: Nymphalid butterflies diversify following near demise at the Cretaceous/Tertiary boundary. Proceedings of the Royal Society Series B Biological Sciences 276: 4295-4302