Cattet, M., Stenhouse, G., Janz, D., Kapronczai, L., Erlenbach, A., Jansen, H., … Boulanger, J. The quantification of reproductive hormones in the hair of captive adult brown bears and their application as indicators of sex and reproductive state. Conservation Physiology, 5(1), cox032. https://doi.org/10.1093/conphys/cox032 (Original work published 2017)