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1.- Direct comparison of astronomical and 40Ar/39Ar ages of ash beds: potential implications for the age of mineral datings standards Hilgen, Frederik J.; Krijgsman, W.; Wijbrans, J.R. [S.l.]: American Geophysical Union, 1997 Geophysical Research Letters III/10-5-15 Ver registro
2.- The Monte del Casino section (Northern Apennines, Italy): a potential Tortonian/ Messinian boundary stratotype? Krijgsman, W.; Hilgen, Frederik J.; Negri, A.; Wijbrans, J.R.; Zachariasse, W.J. Amsterdam: Elsevier Science, 1997 Palaeogeography, Palaeoclimatology, Palaeoecology Cª 337-62 Ver registro
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