by H. Landolt, K. H. Hellwege, A. M. Hellwege, D. Bonnenberg, E.L. Boyd, B.A. Calhoun, V.J. Folen, W. Gräper, A.P. Greifer, C.J. Kriessman, R.A. Lefever, T.R. McGuire, M. Paulus, G.H. Strauss, R. Vautier, H.P.J. Wijn
1970
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