MathSciNet bibliographic data MR1824674 (2002b:34117) 34K13 Xu, Yuan-Tong; Guo, Zhi-Ming Applications of a \$Z\sb p\$$Z\sb p$ index theory to periodic solutions for a class of functional differential equations. J. Math. Anal. Appl. 257 (2001), no. 1, 189–205. Article

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