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Optik - International Journal for Light and Electron Optics > 2013 > 124 > 12 > 1243-1249
Optics Communications > 2002 > 205 > 4-6 > 421-425
Optik - International Journal for Light and Electron Optics > 2013 > 124 > 12 > 1243-1249
Optics Communications > 2002 > 205 > 4-6 > 421-425