Oscillation of linear retarded differential equation Rudolf Oláh — 1984 Czechoslovak Mathematical Journal
On oscillation of solutions of nonlinear retarded differential equation of Emden-Fowler type Rudolf Oláh — 1984 Czechoslovak Mathematical Journal
Note on the oscillatory behavior of bounded solutions of higher order differential equation with retarded argument Rudolf Oláh — 1978 Archivum Mathematicum
On oscillation of solutions of linear deviating differential equation Rudolf Oláh — 1985 Archivum Mathematicum
Note on the oscillation of linear delay differential equations Rudolf Oláh — 1980 Archivum Mathematicum
Note on the oscillation of differential equations with deviating argument Rudolf Oláh — 1982 Časopis pro pěstování matematiky
Note on the oscillatory behaviour of bounded solutions of a higher order differential equation with retarded argument Rudolf Oláh — 1977 Sborník prací Přírodovědecké fakulty University Palackého v Olomouci. Matematika
Integral conditions of oscillation of a linear differential equation Rudolf Oláh — 1989 Mathematica Slovaca
Note on the oscillation of differential equation with advanced argument Rudolf Oláh — 1983 Mathematica Slovaca
On positive solutions of nonlinear retarded differential equations Rudolf Oláh — 1992 Mathematica Slovaca