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Letters in Mathematical Physics > 2001 > 58 > 3 > 209-222
Letters in Mathematical Physics > 1999 > 48 > 3 > 263-276
Physics Letters A > 1998 > 244 > 1-3 > 160-164
Letters in Mathematical Physics > 2001 > 58 > 3 > 209-222
Letters in Mathematical Physics > 1999 > 48 > 3 > 263-276
Physics Letters A > 1998 > 244 > 1-3 > 160-164