1. Akhmetiev, M.A.: The climate of the epoch in context of the significant changes in Biosphere. Transactions of the Geological Institute RAS, issue 350, Moscow, Nauka Press (2004). (in Russian)
2. Angelone, Ch., Hir, J.: Alloptox katinkae sp. nov. (Lagomorpha, Ochotonidae), westernmost Eurasian record of the genus from the early Middle Miocene vertebrate fauna of Litke 2 (N Hungary). Neues Jahrbuch fuer Geologie und Palaeontologie, Abhandlungen 264(1), 1–10 (2012)
3. Asher, R.J., et al.: Stem Lagomorpha and the antiquity of Glires. Science 307, 1091–1094 (2005)
4. Bohlin, B. Oberoligocene Säugetiere aus dem Shargaltein-Tal.—Sino-Swedish Expedition. VI, 2.—Palaeont. Sinica, New Ser. C, 3 (Whole Ser. 107), pp. 1– 66 (1937)
5. Bucher, H.: Etude des genres Marcuinomys Lavocat et Lagopsis Schlosser (Lagomorpha, Mammalia) du Miocene inferieur et moyen de France. Implications biostratigraphiques et phylogenetiques. Bull. Mus. Natl. Histoire naturales. Ser. 4, Sect. C 1/2, 43–74 (1982)