Herbert, T. D.; Erba, E.; Premoli-Silva, Isabella; Fischer, A. G.; Park, J. (1989): Improvements of Cretaceous geochronology using Earth's orbital pacemaker; status and prospects. [International Geological Congress], [location varies], International, In: Anonymous, 28th international geological congress; abstracts, 28, Vol. 2, 2.51-2.52, georefid:1993-006297