P.J. Felder; E. Keppens; B. Declercq; S. Normand; M. Streel. 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. njg 2003, 82, 275-281.