by Nagy, Noémi M, Kónya, József
Year of Publication 2010

by Thompson, Michael, Potts, Philip J., Kane, Jean S., Webb, Peter C., Watson, John S.
Published in Geostandards Newsletter (01.06.2000)

by Tossell, John A., Vaughan, David J.
Year of Publication 1992

by Guyot, François
Published in Nature (London) (02.06.1994)