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Physics Letters A > 2002 > 301 > 5-6 > 350-360
Physics Letters A > 2000 > 275 > 4 > 238-243
Physics Letters A > 1998 > 237 > 4-5 > 234-239
Physics Letters A > 2002 > 301 > 5-6 > 350-360
Physics Letters A > 2000 > 275 > 4 > 238-243
Physics Letters A > 1998 > 237 > 4-5 > 234-239