Kells, L. M. (1965). Elementary differential equations (Ed.6.). Mc Graw - Hill.
Dyfyniad Arddull ChicagoKells, Lyman M. Elementary Differential Equations. Ed.6. New Delhi: Mc Graw - Hill, 1965.
Dyfyniad MLAKells, Lyman M. Elementary Differential Equations. Ed.6. Mc Graw - Hill, 1965.
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