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Introduction to the theory of linear differential equations. Unabridged and unaltered republ. of the first ed. 1936. (English) Zbl 0090.30202
New York: Dover Publications, Inc. VIII, 202 p. (1960).
See the review of the first ed. in [Zbl 0014.05801] resp. [JFM 62.1277.01].

34-01 Introductory exposition (textbooks, tutorial papers, etc.) pertaining to ordinary differential equations