Optik - International Journal for Light and Electron Optics
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 2 > 128-132
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 18 > 1654-1656
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 22 > 1997-2000