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Optik - International Journal for Light and Electron Optics > 2014 > 125 > 20 > 5969-5972
Optik - International Journal for Light and Electron Optics > 2013 > 124 > 24 > 7049-7052
Optik - International Journal for Light and Electron Optics > 2014 > 125 > 20 > 5969-5972
Optik - International Journal for Light and Electron Optics > 2013 > 124 > 24 > 7049-7052