Optik - International Journal for Light and Electron Optics
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 15 > 1376-1380
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 18 > 1598-1602
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 20 > 1862-1864