Estes, Richard.; Hecht, Max K., 1925-; Hoffstetter, Robert.
(New York, N.Y. : American Museum of Natural History, 1967)
"The late Paleocene (Thanetian) salamanders from Cernay, France, include Palaeoproteus gallicus, new species, Koaliella sp., and cf. Salamandra sp. Palaeoproteus has been known formerly only from the middle Eocene Braunkohle ...