by Brudanin, V.B., Egorov, V.G., Kovalik, A., Kovalenko, V.E., Rukhadze, N.I., Salamatin, A.V., Sandukovsky, V.G., Timkin, V.V., Vylov, Ts, Zaparov, C., Briancon, C., Janout, Z., Konicek, J., Kubasta, J., Pospisil, S., Stekl, I., Vorobel, V.
Published in Czechoslovak journal of physics (01.02.1998)