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Steffen, Martina L.; Fulton, Tara L. (2018-02-01). "On the association of giant short-faced bear (Arctodus simus) and brown bear (Ursus arctos) in late Pleistocene North America". Geobios. 51 (1): 61–74. Bibcode:2018Geobi..51...61S. doi:10.1016/j.geobios.2017.12.001.
Valerius Geist: Wolves and the dark side of the dogma "nature knows best", or why practical management is vital for high biodiversity, productivity and a humane treatment of wildlife. In: Beiträge zur Jagd- und Wildforschung. No 44, page 65-71 (PDF)