| http://www.w3.org/ns/prov#value | - View at Publisher ?? View at Google Scholar ?? View at Zentralblatt MATH ?? View at MathSciNetB. Liu and L. Huang, ???Existence and uniqueness of periodic solutions for a kind of Li??nard equation with a deviating argument,??? Applied Mathematics Letters, vol. 21, no. 1, pp. 56???62, 2008.
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