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S. E. S. H. A. D. E. V.  PADHI, SRIVASTAVA, S. H. I. L. P. E. E., and PATI, S. M. I. T. A., ?POSITIVE PERIODIC SOLUTIONS FOR FIRST ORDER FUNCTIONAL DIFFERENTIAL EQUATIONS?, Communications in Applied Analysis, vol. 14, no. 4, p. 462, 2010.\par \par S. E. S. H. A. D. E. V.  PADHI, QIAN, C. H. U. A. N. X. I., and SRIVASTAVA, S. H. I. L. P. E. E., ?MULTIPLE PERIODIC SOLUTIONS FOR A FIRST ORDER NONLINEAR FUNCTIONAL DIFFERENTIAL EQUATION WITH APPLICATIONS TO POPULATION DYNAMICS?, vol. 12, no. 3, p. 11, 2008.\par \par }