Optik - International Journal for Light and Electron Optics
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 3 > 189-192
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 5 > 409-413
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 14 > 1304-1306