Note on the oscillation of differential equations with deviating argument Rudolf Oláh (1982) Časopis pro pěstování matematiky Similarity:
Oscillatory properties of solutions of second-order nonlinear delay differential equations Pavol Šoltés (1981) Mathematica Slovaca Similarity:
Note on the oscillation of linear delay differential equations Rudolf Oláh (1980) Archivum Mathematicum Similarity: