Piaggio, H. T. H. (1962). Elementary treatise on differential equations and their applications.
استشهاد بنمط شيكاغوPiaggio, H. T. H. Elementary Treatise on Differential Equations and Their Applications. 1962.
MLA استشهادPiaggio, H. T. H. Elementary Treatise on Differential Equations and Their Applications. 1962.
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