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Physics Letters A > 2011 > 375 > 20 > 2079-2081
Physica E: Low-dimensional Systems and Nanostructures > 2010 > 42 > 10 > 2830-2833
Physics Letters A > 2011 > 375 > 20 > 2079-2081
Physica E: Low-dimensional Systems and Nanostructures > 2010 > 42 > 10 > 2830-2833