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Physics Letters A > 2016 > 380 > 48 > 4100-4104
Physica E: Low-dimensional Systems and Nanostructures > 2016 > 82 > C > 71-78
Physica E: Low-dimensional Systems and Nanostructures > 2016 > 78 > C > 92-99
Solid State Sciences > 2009 > 11 > 5 > 935-941