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P.J. Felder, E. Keppens, B. Declercq, S. Normand and M. Streel 2003. Faunal/floral and isotopic responses to Milankovitch precession cycles and environmental changes in the upper Gulpen Formation (Upper Maastrichtian) at the CBR-Lixhe and ENCI-Maastricht bv quarries. Netherlands Journal of Geosciences. 82, (Aug. 2003), 275-281. DOI:https://doi.org/10.1017/S0016774600020862.