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Donaire, Mario and López Martínez, Nieves (2009) Porosity of Late Paleocene Ornitholithus eggshells (Tremp Fm, south-central Pyrenees, Spain: Palaeoclimatic implications. Palaeogeography, palaeoclimatology, palaeoecology , 279 (3-4). pp. 147-159. ISSN 0031-0182