王培光 , 唐楠 , 高春霞 . 一类具有连续偏差变元的二阶半线性微分方程的振动准则[J]. 河北大学学报(自然科学版), 2005 , 25(6) : 574 -579 . DOI: 10.3969/j.issn.1000-1565.2005.06.003

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