Journal article published in 1990 by R. Much, Schönfelder, H. Aarts, K. Bennett, A. Deerenberg, R. Diehl , G. Eymann, W.~J den Herder, W. Hermsen, G. Lichti, J. Lockwood, J. Macri, M. McConnell, D. Morris, J. Ryan and other authors. R. Much, Schönfelder, H. Aarts, K. Bennett, A. Deerenberg, R. Diehl , G. Eymann, W.~J den Herder, W. Hermsen, G. Lichti, J. Lockwood, J. Macri, M. McConnell, D. Morris, J. Ryan, G. Simpson, H. Steinle, W.~A Strong, N.~B Swanenburg, C. de Vries, C. Winkler

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