Robu, M., Fortin, J. K., Richards, M. P., Schwartz, C. C., Wynn, J. G., Robbins, C. T., et al. (2013). Isotopic evidence for dietary flexibility among European Late Pleistocene cave bears (Ursus spelaeus). Canadian Journal of Zoology, 91(4), 227-234. doi:10.1139/cjz-2012-0222.