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2. P. R. Beesack, Integral inequalities involving a function and its derivative,Amer. Math. Monthly,78 (1971), 705–741.
3. I. Bihari, Ausdehnung der Strurm'schen Oscillations- und Vergleichssätze auf die Lösungen gewisser nichtlinearer Differentialgleichungen zweiter Ordnung,Publicationes Math. Inst. Hung. Acad. Sci.,2 (1957), 159–173.
4. I. Bihari, Extension of certain theorems of the Sturmian type to nonlinear second order differential equations, ibid.,3 (1958), 13–20.
5. I. Bihari, Asymptotic behaviour of the solutions of certain second order differential equations perturbed by a half-linear term, ibid.,6 (1961), 291–293.