The oldest representative of Entelodontoidea (Artiodactyla, Suiformes) from the Middle Eocene of Khaichin-Ula 2, Mongolia, and some evolutionary features of this superfamily. Paleontologicheskii Zhurnal, 6, Noyabr-Dekabr 2008: 69-80. 72 [Zoological Record Volume 145]