Chinese Quarterly Journal of Mathematics ›› 1989, Vol. 4 ›› Issue (3): 89-90.
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俞元洪. 二阶非线性时滞方程的振动定理[J]. Chinese Quarterly Journal of Mathematics, 1989, 4(3): 89-90.
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URL: https://sxjk.magtechjournal.com/EN/
https://sxjk.magtechjournal.com/EN/Y1989/V4/I3/89
