@book{ BA19949735,
 author = "Lefschetz, Solomon",
 title = "Lectures on differential equations",
 publisher = "Kraus Reprint",
 year = "1965",
 series = "Annals of mathematics studies",
 number = "no. 14",
 URL = "https://ci.nii.ac.jp/ncid/BA19949735"
}
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