Optik - International Journal for Light and Electron Optics
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 9 > 769-772
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 12 > 1050-1057
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 16 > 1478-1480