Hopf, L., & Nef, W. (1948). Introduction to the differential equations of physics. New York: Dover Publications.
Παραπομπή Chicago StyleHopf, Ludwig, and Walter Nef. Introduction to the Differential Equations of Physics. New York: Dover Publications, 1948.
Παραπομπή MLAHopf, Ludwig, and Walter Nef. Introduction to the Differential Equations of Physics. New York: Dover Publications, 1948.
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