by Rong-Kun, Xu, Zheng-Hong, Li, Jia-Min, Ning, Cun, Guo, Ze-Ping, Xu, Jian-Lun, Yang, Lin-Bo, Li, Guang-Xin, Xia, Xin-Sheng, Hua, Ning, Ding, Qiang, Liu, Yuan-Chao, Gu, Grabovsky, E. V, Oleynic, G. M, Nedoseev, S. L, Alexandrov, V. V, N.Mitrofanov, K, Zurin, M. V, Volkov, G. S, Porofeev, I. A, Frolov, I. N, Smirnov, V. P
Published in Chinese physics letters (01.02.2005)