Preparatory correspondence with G. Framhein, H.P. Furrer, H.J. Glaesner, I. Gullnäs, W.M. Hauschild, J. Hellner, J.H. Jacob, J.T. Johnsen, O. Kahn-Freund, M.D. Kirby, T. Kojima, H. Kötz, R. Krieps, J.E. Krings, O. Lando, P. Leask, P. Leleux, E. Likhovski, N. Mangard, W.F.G. Meurs, D.A. Molony, A.D.M. Oulton, J.A.H.M. Peek, J.P. Plantard, T. Roseingrave, I. Samkalden, G. Schricker, P. Schuster, K. Schuyt, A. Schonfield, H. Simon, S. Stone, M. Storme, H. Street, Y. Taniguchi, G.D.S. Taylor, J.J. Toharia, C.C. Tornaritis, A. Tunc, M. Zagari, Zamir, M. Zander, F. Zemans

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