1. S. R. Bernfeld and L. Salvadori, Stability and bifurcation, to appear.
2. On partial asymptotic stability and instability, III;Hatvani;Acta Sci. Math.,1985
3. On the asymptotic stability of nondecrescent Lyapunov function;Hatvani;Nonlinear Anal.,1984
4. V. Lakshmikantham, Recent trends in the theory of stability by Lyapunov's second method, in “Proceedings of International Conference on Nonlinear Analysis and Applications, Waltair, India,” to appear.