Hyperinvariant subspaces of operators on Hilbert spaces Štefan Drahovský; Michal Zajac — 1994 Banach Center Publications
Hyperreflexive operators on finite dimensional Hilbert spaces Štefan Drahovský; Michal Zajac — 1993 Mathematica Bohemica In this paper a complete characterization of hyperreflexive operators on finite dimensional Hilbert spaces is given.