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1.

図書
図書
1. Differential equations of the second order with retarded argument : some problems of the theory of vibrations of systems with retardation
by S.B. Norkin ; [translated from the Russian by L.J. Grimm and K. Schmitt]
出版情報: Providence, R.I. : American Mathematical Society, 1972
シリーズ名: Translations of mathematical monographs ; v. 31
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2.

図書
図書
2. Introduction to the theory and application of differential equations with deviating arguments
L.E. Ėlʹsgolʹt︠s︡ and S.B. Norkin ; translated by John L. Casti
出版情報: New York : Academic Press, 1973
シリーズ名: Mathematics in science and engineering : a series of monographs and textbooks ; v. 105
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