G.F.W. HERNGREEN; J.H.A. VAN KONIJNENBURG - VAN CITTERT; H.W. OOSTERINK. New geological data (Middle Triassic, Rhaetian-Liassic and Oligocene) of the Winterswijk quarry, the eastern Netherlands. Netherlands Journal of Geosciences, v. 84, p. 409 - 413, 1 Dec. 2005.