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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 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 }