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1. Li, WG
   Periodic solutions for 2kth order ordinary differential equations with resonance
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   W.G. Li, "Periodic solutions for 2kth order ordinary differential equations with resonance", J MATH ANAL, 259(1), 2001, pp. 157-167
2. Liu, XZ; Fu, XL
   High order nonlinear differential inequalities with distributed deviating arguments and applications
   APPLIED MATHEMATICS AND COMPUTATION
   
   X.Z. Liu e X.L. Fu, "High order nonlinear differential inequalities with distributed deviating arguments and applications", APPL MATH C, 98(2-3), 1999, pp. 147-167
3. LI WJ; DUAN KC
   INSTABILITY THEOREMS FOR CERTAIN NTH ORDER DIFFERENTIAL-EQUATIONS
   Journal of the Australian Mathematical Society. Series A. Pure mathematics and statistics
   
   W.J. Li e K.C. Duan, "INSTABILITY THEOREMS FOR CERTAIN NTH ORDER DIFFERENTIAL-EQUATIONS", Journal of the Australian Mathematical Society. Series A. Pure mathematics and statistics, 59, 1995, pp. 1-7