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Optik - International Journal for Light and Electron Optics > 2013 > 124 > 17 > 2807-2810
Indian Journal of Physics > 2010 > 84 > 8 > 1101-1109
Optik - International Journal for Light and Electron Optics > 2013 > 124 > 17 > 2807-2810
Indian Journal of Physics > 2010 > 84 > 8 > 1101-1109