Optik - International Journal for Light and Electron Optics
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 5 > 428-432
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 17 > 1592-1596
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 18 > 1605-1608