Optik - International Journal for Light and Electron Optics
Optik - International Journal for Light and Electron Optics > 2001 > 112 > 12 > 588-592
Optik - International Journal for Light and Electron Optics > 2001 > 112 > 12 > 550-554
Optik - International Journal for Light and Electron Optics > 2001 > 112 > 12 > 545-549