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Optica Applicata > 2008 > Vol. 38, nr 1 > 17-24
Journal of Achievements in Materials and Manufacturing Engineering > 2006 > Vol. 17, nr 1-2 > 221--224
Optica Applicata > 2008 > Vol. 38, nr 1 > 17-24
Journal of Achievements in Materials and Manufacturing Engineering > 2006 > Vol. 17, nr 1-2 > 221--224