TY - BOOK TI - Variational methods for strongly indefinite problems AU - Y.-H. Ding PB - Interdisciplinary Mathematical Sciences, World Scientific Publishing Co. Pte. Ltd., Hackensack PY - 2007 DA - 2007// CY - NJ ID - Ding2007 ER - TY - JOUR TI - Existence of infinitely many solutions for a Neumann problem involving the p(x)-Laplacian AU - X.-L. Fan AU - C. Ji JO - J. Math. Anal. Appl. PY - 2007 DA - 2007// VL - 334 ID - Fan2007 ER - TY - JOUR TI - Existence of periodic and subharmonic solutions for second-order superlinear difference equations AU - Z.-M. Guo AU - J.-S. Yu JO - Sci. China Ser. A PY - 2003 DA - 2003// VL - 46 ID - Guo2003 ER - TY - JOUR TI - The existence of periodic and subharmonic solutions of subquadratic second order difference equations AU - Z.-M. Guo AU - J.-S. Yu JO - J. London Math. Soc. PY - 2003 DA - 2003// VL - 68 ID - Guo2003 ER - TY - JOUR TI - Periodic solutions of second order discrete convex systems involving the p-Laplacian AU - T.-S. He AU - W. Chen JO - Appl. Math. Comput. PY - 2008 DA - 2008// VL - 206 ID - He2008 ER - TY - JOUR TI - Homoclinic solutions for second order discrete p-Laplacian systems AU - X.-F. He AU - P. Chen JO - Adv. Difference Equ. PY - 2011 DA - 2011// VL - 2011 ID - He2011 ER - TY - JOUR TI - Periodic and subharmonic solutions of a class of subquadratic second-order Hamiltonian systems AU - Q. Jiang AU - C.-L. Tang JO - J. Math. Anal. Appl. PY - 2007 DA - 2007// VL - 327 ID - Jiang2007 ER - TY - JOUR TI - Periodic solutions for non-autonomous second-order differential systems with (q, p)-Laplacian AU - C. Li AU - Z.-Q. Ou AU - C.-L. Tang JO - Electron. J. Differential Equations PY - 2014 DA - 2014 // VL - 2014 ID - Li2014 ER - TY - JOUR TI - Infinitely many periodic solutions for second-order (p, q)-Laplacian differential systems AU - Y.-K. Li AU - T.-W. Zhang JO - Nonlinear Anal. PY - 2011 DA - 2011// VL - 74 ID - Li2011 ER - TY - JOUR TI - Existence of infinitely many homoclinic orbits in discrete Hamiltonian systems AU - X.-Y. Lin AU - X.-H. Tang JO - J. Math. Anal. Appl. PY - 2011 DA - 2011// VL - 373 ID - Lin2011 ER - TY - JOUR TI - A generalized saddle point theorem AU - J.-Q. Liu JO - J. Differential Equations PY - 1989 DA - 1989// VL - 82 ID - Liu1989 ER - TY - BOOK TI - Variational methods in differential equations AU - W.-D. Lu PB - Science Press, Beijing PY - 2002 DA - 2002// CY - China ID - Lu2002 ER - TY - JOUR TI - Homoclinic orbits and subharmonics for nonlinear second order difference equations AU - M.-J. Ma AU - Z.-M. Guo JO - Nonlinear Anal. PY - 2007 DA - 2007// VL - 67 ID - Ma2007 ER - TY - JOUR TI - Periodic solutions of second order nonlinear difference systems with \(\phi\)-Laplacian: a variational approach AU - J. Mawhin JO - Nonlinear Anal. PY - 2012 DA - 2012// VL - 75 ID - Mawhin2012 ER - TY - JOUR TI - Periodic solutions of second order Lagrangian difference systems with bounded or singular \(\phi\)-Laplacian and periodic potential AU - J. Mawhin JO - Discrete Contin. Dyn. Syst. Ser. S PY - 2013 DA - 2013// VL - 6 ID - Mawhin2013 ER - TY - BOOK TI - Critical point theory and Hamiltonian systems AU - J. Mawhin AU - M. Willem PB - Applied Mathematical Sciences, Springer- Verlag PY - 1989 DA - 1989// CY - New York ID - Mawhin1989 ER - TY - JOUR TI - Some existence results on periodic solutions of nonautonomous second-order differential systems with (q, p)-Laplacian AU - D. Paşca AU - C.-L. Tang JO - Appl. Math. Lett. PY - 2010 DA - 2010// VL - 23 ID - Paşca2010 ER - TY - JOUR TI - Some existence results on periodic solutions of ordinary (q, p)-Laplacian systems AU - D. Paşca AU - C.-L. Tang JO - J. Appl. Math. Inform. PY - 2011 DA - 2011// VL - 29 ID - Paşca2011 ER - TY - BOOK TI - Minimax methods in critical point theory with applications to differential equations AU - P. H. Rabinowitz PB - CBMS Regional Conference Series in Mathematics,/ Published for the Conference Board of the Mathematical Sciences, Washington, DC; by the American Mathematical Society, Providence PY - 1986 DA - 1986// CY - RI ID - Rabinowitz1986 ER - TY - JOUR TI - A further refinement of a three critical points theorem AU - B. Ricceri JO - Nonlinear Anal. PY - 2011 DA - 2011// VL - 74 ID - Ricceri2011 ER - TY - BOOK TI - Minimax systems and critical point theory AU - M. Schechter PB - Birkhäuser Boston, Inc., Boston PY - 2009 DA - 2009// CY - MA ID - Schechter2009 ER - TY - JOUR TI - Notes on periodic solutions of subquadratic second order systems AU - C.-L. Tang AU - X.-P. Wu JO - J. Math. Anal. Appl. PY - 2003 DA - 2003// VL - 285 ID - Tang2003 ER - TY - JOUR TI - Periodic solutions for second-order discrete Hamiltonian systems AU - X.-H. Tang AU - X.-Y. Zhang JO - J. Difference Equ. Appl. PY - 2011 DA - 2011// VL - 17 ID - Tang2011 ER - TY - JOUR TI - Multiple periodic solutions for a class of nonlinear difference systems with classical or bounded (\(\phi_1,\phi_2\))-Laplacian AU - Y. Wang AU - X.-Y. Zhang JO - Adv. Difference Equ. PY - 2014 DA - 2014// VL - 2014 ID - Wang2014 ER - TY - JOUR TI - Existence of a periodic solution for subquadratic second-order discrete Hamiltonian system AU - Y.-F. Xue AU - C.-L. Tang JO - Nonlinear Anal. PY - 2007 DA - 2007// VL - 67 ID - Xue2007 ER - TY - JOUR TI - Periodic solutions for autonomous (q, p)-Laplacian system with impulsive effects AU - X.-X. Yang AU - H.-B. Chen JO - J. Appl. Math. PY - 2011 DA - 2011// VL - 2011 ID - Yang2011 ER - TY - JOUR TI - Notes on periodic solutions for a nonlinear discrete system involving the p-Laplacian AU - X.-Y. Zhang JO - Bull. Malays. Math. Sci. Soc. PY - 2014 DA - 2014// VL - 37 ID - Zhang2014 ER - TY - JOUR TI - Existence of solutions for a nonlinear discrete system involving the p-Laplacian AU - X.-Y. Zhang AU - X.-H. Tang JO - Appl. Math. PY - 2012 DA - 2012// VL - 57 ID - Zhang2012 ER - TY - JOUR TI - Existence of periodic solutions for a class of discrete Hamiltonian systems AU - Q.-F. Zhang AU - X.-H. Tang AU - Q.-M. Zhang JO - Discrete Dyn. Nat. Soc. PY - 2011 DA - 2011// VL - 2011 ID - Zhang2011 ER - TY - JOUR TI - Homoclinic solutions for a class of nonlinear difference systems with classical (\(\phi_1,\phi_2\))-Laplacian AU - X.-Y. Zhang AU - Y. Wang JO - Adv. Difference Equ. PY - 2015 DA - 2015// VL - 2015 ID - Zhang2015 ER - TY - JOUR TI - Multiple periodic solutions for two classes of nonlinear difference systems involving classical (\(\phi_1,\phi_2\))-Laplacian AU - X.-Y. Zhang AU - L. Wang JO - ArXiv PY - 2016 DA - 2016// VL - 2016 ID - Zhang2016 ER -