Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
D. F. Mertz and C. C. Swisher and J. L. Franzen and F. O. Neuffer and H. Lutz,"Numerical dating of the Eckfeld maar fossil site, Eifel, Germany: a calibration mark for the Eocene time scale",Naturwissenschaften,0028-1042,Springer Science and Business Media LLC,2000-06-20,87,6,270-274,https://cir.nii.ac.jp/crid/1363388845725423488,https://doi.org/10.1007/s001140050719