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![](./img/clear.gif) 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
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![](./img/clear.gif) 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
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