Metamorphic map of Europe 1:2.500.000. - Gustavson, M.; Strömberg, A.; Simonen, Ahti, 1916-1994; Lundquist, T.; Beljajev, O. A.; Petrov, Valerij Petrovič, 1908-1993; Zagorodny, V. G.; Glebovickij, Viktor Andrejevič, 1935-; Drugova, G. M.; Khlestov, V. V.; Moskovchenko, N. J.; Priatkina, L. A.; et al. (The Subcommission for the cartography of the metamorphic belts of the world, 1973)