Wolfgang Goymann, Marion L. East, Bettina Wachter, Oliver P. Höner, Erich Möstl, Thomas J. Van't Holf, Heribert Hofer,
Social, state-dependent and environmental modulation of faecal corticosteroid levels in free-ranging female spotted hyenas. Proceedings of The Royal Society B: Biological Sciences. ,vol. 268, pp. 2453- 2459 ,(2001) ,
10.1098/RSPB.2001.1828