Optik - International Journal for Light and Electron Optics
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 2 > 177-181
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 11 > 986-990
Optik - International Journal for Light and Electron Optics > 2011 > 122 > 14 > 1231-1235