By Gill Tarsem S.   Bains Amandeep Singh   Saini Narsehpal Singh   in Canadian Journal of Physics

ISSN:1208-6045|87|8|861-866

NRC Research Press‎(2009)‎

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By Gill Tarsem S.   Saini Nareshpal Singh   Kaul S S   Singh Arvinder   in Optik – International Journal for Light and Electron Optics

ISSN:0030-4026|115|11|493-498

Urban & Fischer‎(2004)‎

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