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Physica E: Low-dimensional Systems and Nanostructures > 2009 > 41 > 6 > 1048-1051
Physica E: Low-dimensional Systems and Nanostructures > 2009 > 41 > 6 > 1067-1070
Journal of Luminescence > 2007 > 126 > 2 > 581-589
Optica Applicata > 2007 > Vol. 37, nr 1-2 > 21-30