by Ajinenko, I.V., Den Bekker, E., Belokopytov, Yu.A., Böttcher, H., Botterweck, F., Chliapnikov, P.V., Crijns, F., De Roeck, A., De Wolf, E.A., Dziunikowksa, K., Endler, A.M.F., Ermolov, P.F., Garutchava, Z.G., Grigoryan, N.G., Van Hal, P., Haupt, T., Kittel, W., Kishinevskaya, L.P., Levchenko, B.B., Machowski, B., Meijers, F., Michałowska, A.B., Nikolaenko, V.I., Oliveira, L.C.S., Olkiewicz, K., Ronjin, V.M., Rybin, A.M., Saarikko, H.M.T., Scholten, L., Shabalina, E.K., Stepaniak, J., Tchikilev, O.G., Tikhonova, L.A., Uvarov, V.A., Verbeure, F., Wischnewski, R.
Published in Physics letters. B (01.02.1990)