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Physics Letters A > 2004 > 322 > 1-2 > 60-66
Physics Letters A > 2002 > 298 > 1 > 7-17
Physics Letters A > 1999 > 261 > 3-4 > 150-157
Physics Letters A > 2004 > 322 > 1-2 > 60-66
Physics Letters A > 2002 > 298 > 1 > 7-17
Physics Letters A > 1999 > 261 > 3-4 > 150-157