by E. Buchborn, M. Classen, W. Dölle, R. Gross, J. van de Loo, G. Riecker, P. C. Scriba, W. Siegenthaler, P. von Wichert
1988
by G. Riecker, A. Weber, J. Goodwin, H.-D Bolte
1977
by G. Riecker, H. Avenhaus, H. D. Bolte, W. Hort, B. Lüderitz
2013
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