Authors: Hilde Van Esch, Peter Groenen, M. Andrew Nesbit, Simone Schuffenhauer, Peter Lichtner, Gert Vanderlinden, Brian Harding, Rolf Beetz, Rudolf W. Bilous, I. M. Holdaway, Nicholas J Shaw, J P Fryns, Wim Van de Ven, Rajesh V. Thakker, Koenraad Devriendt - Nature 2000 cited by 660
