D. J. E. Murdock, S. E. Gabbott & M. A. Purnell: The impact of taphonomic data on phylogenetic resolution: Helenodora inopinata (Carboniferous, Mazon Creek Lagerstätte) and the onychophoran stem lineage. In: BMC Evolutionary Biology. Bd. 16, 2016, Art.-Nr. 19. doi:10.1186/s12862-016-0582-7