H.B. VONHOF; J.W.M. JAGT; A. IMMENHAUSER; J. SMIT; Y.W. VAN DEN BERG; M. SAHER; N. KEUTGEN; J.J.G. REIJMER. Belemnite-based strontium, carbon and oxygen isotope stratigraphy of the type area of the Maastrichtian Stage. Netherlands Journal of Geosciences, v. 90, p. 259 - 270, 1 Nov. 2011.