1. Á. Elbert, Oscillation and nono s dilation theorems for some nonlinear ordinary differential equations, Ordinary and Partial Differential Equations (Dundee, 1982), Lecture Notes in Mathematics, vol. 964, Springer, Berlin — Heidelberg — New York, 1982, pp. 187–212.
2. Á. Elbert, Asymptotic behaviour of autonomous half-linear differential systems on the plane, Studia Sci. Math. Hungar. 19 (1984), 447–464.
3. Á. Elbert, Generalized Riccati equation for half-linear second order differential equations, Differential and Integral Equations: Qualitative Theory. Colloq. Math. Soc. J. Bolyai, vol. 47, 1984, pp. 227–249.
4. Á. Elbert, Qualitative Theory of Half-linear Differential Equations, Dissertation for Doctoral Degree, 1987. (Hungarian)
5. Á. Elbert and T. Kusano, Principal solutions of non-oscillatory half-linear differential equations, Advances in Mathematical Sciences and Applications 8 (1998), 745–759.