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D. A. H. M. A. N. E.  BOUAFIA, Graef, J. R., and MOUSSAOUI, T. O. U. F. I. K., ?EXISTENCE OF SOLUTIONS FOR A PERTURBED SECOND ORDER PROBLEM ON THE HALF-LINE VIA EKELAND?S VARIATIONAL PRINCIPLE?, EXISTENCE OF SOLUTIONS, vol. 22, no. 3, p. 18, 2018.\par \par J. R.  Graef, KONG, L. I. N. G. J. U., KONG, Q. I. N. G. K. A. I., and WANG, M. I. N., ?A FRACTIONAL BOUNDARY VALUE PROBLEM WITH DIRICHLET BOUNDARY CONDITION?, vol. 19, no. 4, p. 8, 2015.\par \par J. R.  Graef, KONG, L. I. N. G. J. U., and WANG, M. I. N., ?INFINITELY MANY HOMOCLINIC SOLUTIONS FOR SECOND ORDER DIFFERENCE EQUATIONS WITH p-LAPLACIAN?, vol. 19, no. 1, p. 8, 2015.\par \par J. R.  Graef, KONG, L. I. N. G. J. U., and WANG, M. I. N., ?TWO NONTRIVIAL SOLUTIONS FOR A DISCRETE FOURTH ORDER PERIODIC BOUNDARY VALUE PROBLEM?, vol. 19, no. 4, p. 10, 2015.\par \par J. R.  Graef, KONG, L. I. N. G. J. U., KONG, Q. I. N. G. K. A. I., and YANG, B. O., ?HIGHER ORDER BOUNDARY VALUE PROBLEMS WITH TWO POINT SEPARATED NONHOMOGENEOUS BOUNDARY CONDITIONS?, vol. 15, no. 4, p. 22, 2011.\par \par M. I. R. O. S. L. A. V.  BARTUSEK and Graef, J. R., ?STRONG NONLINEAR LIMIT-POINT/LIMIT-CIRCLE PROPERTIES FOR A CLASS OF FOURTH ORDER EQUATIONS?, Communications in Applied Analysis, vol. 11, no. 4, p. 484, 2007.\par \par B. C.  Dhage and Graef, J. R., ?MONOTONE TECHNIQUE FOR FIRST ORDER DISCONTINUOUS FUNCTIONAL DIFFERENTIAL INCLUSIONS?, Communications in Applied Analysis, vol. 10, no. 3, p. 416, 2006.\par \par J.  Karsai, Graef, J. R., and QIAN, C. H. U. A. N. X. I., ?ASYMPTOTIC BEHAVIOR OF SOLUTIONS OF OSCILLATOR EQUATIONS WITH SUBLINEAR DAMPING?, vol. 6, no. 1, p. 11, 2002.\par \par }