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- [2] PROPERTIES OF SOLUTIONS OF LINEAR-DIFFERENTIAL EQUATION [P(X)Y'(X)]'+Q(X)Y(X)=F(X) ACTA UNIVERSITATIS AGRICULTURAE FACULTAS SILVICULTURAE, 1975, 44 (3-4): : 379 - 395
- [3] ON THE POSITION OF ROOTS OF SOLUTIONS OF THE DIFFERENTIAL-EQUATION Y''+QY=0 WITH [Q(X)]V (VLESS-THAN0) CONCAVE PUBLICATIONES MATHEMATICAE-DEBRECEN, 1982, 29 (3-4): : 299 - 308
- [6] The differential equation y" plus λA(x)y=o COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES, 1905, 140 : 1086 - 1088
- [8] FUNCTIONAL-EQUATION F(X)G(Y)=P(X+Y)Q(X/Y) NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1975, 22 (05): : A565 - A565