Optik - International Journal for Light and Electron Optics
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 7 > 645-649
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 13 > 1190-1195
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 14 > 1293-1296