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A Book of Problems in Ordinary Differential Equations

Mikhail Leontʹevich KrasnovAleksandr Ivanovich KiselevGrigoriĭ Ivanovich Makarenko

出版	Mir, 1981
URL	http://books.google.com.hk/books?id=wmUZAQAAIAAJ&hl=&source=gbs_api