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J. I. F. E. N. G.  CHU and O?REGAN, D. O. N. A. L., ?POSITIVE PERIODIC SOLUTIONS OF SYSTEM OF FUNCTIONAL DIFFERENCE EQUATIONS?, vol. 12, no. 3, p. 10, 2008.\par \par J. I. F. E. N. G.  CHU and O?REGAN, D. O. N. A. L., ?POSITIVE SOLUTIONS AND EIGENVALUE INTERVALS FOR DISCRETE BOUNDARY VALUE PROBLEMS?, vol. 12, no. 3, p. 20, 2008.\par \par J. I. F. E. N. G.  CHU and O?REGAN, D. O. N. A. L., ?POSITIVE SOLUTIONS FOR REGULAR AND SINGULAR FOURTH-ORDER BOUNDARY VALUE PROBLEMS?, vol. 10, no. 2, p. 16, 2006.\par \par }