Hassan, H. A., M. El-Shahed, and Z. S. Mansour,
"ON THE EXISTENCE OF POSITIVE SOLUTIONS OF A NONLINEAR q-DIFFERENCE EQUATION",
FIXED POINT THEORY, vol. 13, issue 2: HOUSE BOOK SCIENCE-CASA CARTII STIINTA 6-8 EROILOR ST, CLUJ-NAPOCA, 400129, ROMANIA, pp. 517-526, 2012.
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