Phase matrix of linear differential systems Ondřej Došlý (1985) Časopis pro pěstování matematiky Similarity:
On the Liouville-type transformation for differential systems Ondřej Došlý (1987) Mathematica Slovaca Similarity:
On some problems in the oscillation theory of self-adjoint linear differential equations Ondřej Došlý (1991) Mathematica Slovaca Similarity: