Optik - International Journal for Light and Electron Optics
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 4 > 286-290
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 12 > 1035-1039
Optik - International Journal for Light and Electron Optics > 2012 > 123 > 12 > 1115-1119