Optik - International Journal for Light and Electron Optics
Optik - International Journal for Light and Electron Optics > 2010 > 121 > 18 > 1665-1669
Optik - International Journal for Light and Electron Optics > 2010 > 121 > 21 > 1944-1947
Optik - International Journal for Light and Electron Optics > 2010 > 121 > 21 > 1976-1980