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Physics Letters A > 2000 > 278 > 1-2 > 99-102
Nuclear Inst. and Methods in Physics Research, B > 1999 > 149 > 1-2 > 81-88
Physics Letters A > 2000 > 278 > 1-2 > 99-102
Nuclear Inst. and Methods in Physics Research, B > 1999 > 149 > 1-2 > 81-88