by Adamus, M., Ajinenko, I.V., Agababyan, N.M., Belokopytov, Y.A., Böttcher, H., Chliapnikov, P.V., Crijns, F., De Roeck, A., De Wolf, E.A., Dziunikowska, K., Gavrjusev, V.G., Endler, A.M.F., Gevorkyan, G.V., Grässler, H., Van Hal, P., Kittel, W., Kirakosyan, Z.A., Kisielewska, D., Klugow, J., Kurnosenko, A.I., Meijers, F., Michałowska, A.B., Nikolaenko, V.I., Oliveira, L.C.S., Olkiewicz, K., Petrovykh, L.P., Riipinen, E., Roloff, H.E., Ronjin, V.M., Rybin, A.M., Saarikko, H.M.T., Saarikko, Y.T.M., Schmitz, W., Scholten, L., Sotnikova, N.A., Tchikilev, O.G., Uvarov, V.A., Verbeure, F., Wischnewski, R., Wróblewski, A.
Published in Physics letters. B (05.03.1987)