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Baryshnikov, G.F.; Lavrov, A.V. (2015). "Early Miocene bear Ballusia (Carnivora, Ursidae) from the locality Khirgis-Nur-I in Mongolia". Proceedings of the Zoological Institute RAS. 319 (3): 341–350. doi:10.31610/trudyzin/2015.319.3.341. S2CID247552126.