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Sehgal D L, Copra K L & Sehgal N K. (1982). Electricity and magnetism. : .
Sehgal D L, Copra K L and Sehgal N K. 1982. Electricity and magnetism. : .
Sehgal D L, Copra K L and Sehgal N K. (1982). Electricity and magnetism. : .
Sehgal D L, Copra K L and Sehgal N K. Electricity and magnetism. : . 1982.