Nickel, Helmut
(1973–1974)
(1991)
Nickel, Helmut, Stuart W. Pyhrr, and Leonid Tarassuk
(1982)
Breiding, Dirk H., and Helmut Nickel
(2010)
LaRocca, Donald J.
(1995)
Pyhrr, Stuart W.
(2000)
Piotrovsky, Boris
Mackay-Smith, Alexander, Jean R. Druesedow, and Thomas Ryder
(1984)
van Miegroet, Hans J.
(1992)