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								J. Litt and R.Meunier, Ann. Rev. Nucl. Sci.,23(1973), 1.[2] S. P. Denisov,et al., Nucl. Instr, and Meth., 85(1970), 101. 
J. Litt and R.Meunier, Ann. Rev. Nucl. Sci.,23(1973), 1.[2] S. P. Denisov,et al., Nucl. Instr, and Meth., 85(1970), 101.