$a Giant entelodont (Mammalia, Artiodactyla) from the Early Miocene of Southern California / Spencer G. Lucas, David P. Whistler and Hugh M. Wagner. - Los Angeles, 1996. $b (Prac. Museum of Natural History and Science w Nowym Meksyku)
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$a Locis-online
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$a Kp. The Triassic timescale / edited by Spencer G. Lucas. - London, 2010. - (Geological Society Special Publication ; no. 334).