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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 A. N. D. R. E. W.  CONNER, WANG, M. I. N., and ZAJACZKOWSKI, C. L. A. I. R. E., ?UNIQUENESS AND PARAMETER DEPENDENCE OF POSITIVE SOLUTIONS OF DISCRETE PERIODIC BOUNDARY VALUE PROBLEMS?, vol. 19, no. 2, p. 11, 2015.\par \par }