Optik - International Journal for Light and Electron Optics
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 2 > 132-136
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 10 > 937-939
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 17 > 1525-1529
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 23 > 2131-2135