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Physics Letters A > 2011 > 375 > 38 > 3370-3374
Annals of Physics > 2010 > 325 > 12 > 2787-2799
Physics Letters A > 2010 > 374 > 22 > 2218-2224
Physics Letters A > 2011 > 375 > 38 > 3370-3374
Annals of Physics > 2010 > 325 > 12 > 2787-2799
Physics Letters A > 2010 > 374 > 22 > 2218-2224