MathSciNet bibliographic data MR976947 (89m:34043) 34C11 Andres, Ján Boundedness results of solutions to the equation $x'''+ax''+g(x)x'+h(x)=p(t)$$x'''+ax''+g(x)x'+h(x)=p(t)$ without the hypothesis $h(x)\,{\rm sgn}\,x\geq 0$$h(x)\,{\rm sgn}\,x\geq 0$ for $\vert x\vert >R$$\vert x\vert >R$. Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Natur. (8) 80 (1986), no. 7-12, 533–539 (1987). Links to the journal or article are not yet available

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