Collins, M. J., Penkman, K. E. H., Rohland, N., Shapiro, B., Dobberstein, R. C., Ritz-Timme, S., et al. (2009). Is amino acid racemization a useful tool for screening for ancient DNA in bone? Proceedings of the Royal Society of London, B, Biological Sciences, 276(1669), 2971-2977. doi:10.1098/rspb.2009.0563.