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4. The geochemistry of 14C in freshwater systems;Broecker;Geochim. Cosmochim. Acta,1959
5. Oxygen isotope composition of shell material from the Danish middle Paleocene (Selandian) deposits and their interpretation as paleotemperatures;Buchardt;Palaeogeogr., Palaeoclimatol., Palaeoecol.,1977