1. Asymptotic behaviour of certain second order differential equations;Mehri;J. Math. Anal. Appl.,1970
2. On some integral inequalities similar to Bellman-Blhari inequalities;Pachpatte;J. Math. Anal. Appl.,1975
3. Stability Theory of Differential Equations;Bellman,1953
4. On the asymptotic behaviour of solutions of second order linear differential equations;Trench,1963
5. Studi asintotici per alcune equazioni differenziali;Fubini;Rend. Reale Accad. Lincei.,1937