[1] Yongxiang Li, Positive radial solutions for elliptic equations with nonlinear gradient terms on the unit ball, Mediterranean Journal of Mathematics, 2020, 17(6): No. 176. [2] Yongxiang Li, Yabing Gao. Existence and uniqueness results for the bending elastic beam equations, Applied Mathematics Letters, 2019, 95: 72-77. [3] Yongxiang Li. Positive radial solutions for elliptic equations with nonlinear gradient terms in an annulus, Complex Variables and Elliptic Equations, 2018, 63(2): 171-187. [4] Yongxiang Li. Existence of positive solutions for the cantilever beam equations with fully nonlinear terms, Nonlinear Analysis: Real World Applications, 2016, 27: 221-237. [5] Yongxiang Li, Positive solutions for second order boundary value problems with derivative terms, Mathematische Nachrichten, 2016, 289(16): 2058–2068. [6] Yongxiang Li. Existence and asymptotic stability of periodic solution for evolution equations with delays. J. Functional Analysis, 2011, 261(5): 1309-1324. [7] Yongxiang Li, Hongxia Fan. Existence of positive periodic solutions for higher order ordinary differential equations. Comput. Math. Appl. 2011, 62(4): 1715-1722. [9] Yongxiang Li. Positive periodic solutions for fully third-order ordinary differential equations. Comput. Math. Appl. 2010, 59(11): 3464-3471. [10] Yongxiang Li. Existence and uniqueness of periodic solution for a class of semilinear evolution equations. J. Math. Anal. Appl. 2009, 349(1): 226-234.