Optik - International Journal for Light and Electron Optics
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 3 > 263-265
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 6 > 490-493
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 20 > 1848-1850
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 22 > 1978-1980