SPIEGEL M. R., . (1959). VECTOR ANALYSIS. NEW YORK: MCGRAW HILL BOOK COMPANY.
SPIEGEL MURRAY R, . 1959. VECTOR ANALYSIS. NEW YORK: MCGRAW HILL BOOK COMPANY.
SPIEGEL MURRAY R, . VECTOR ANALYSIS. NEW YORK: MCGRAW HILL BOOK COMPANY. 1959.
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