O některých Banachových problémech
On measure for projectors
An example of a finite set of projectors in is exhibited for which no 0-1 measure exists.
On measure for projectors. II
On a Class of Normaloid Operators.
On a functional representation of the lattice of projections on a Hilbert space
On a Functional Which is Quadratic on A-orthogonal Vectors
On a lattice characterization of Hilbert spaces
On a Problem of H. Berens.
On a property of Gram's determinant.
On adjoint of an operator on reflexive Banach spaces
On characterizations of inner-product spaces.
On convergence in -inner product spaces.
On discrete subspaces of a Hilbert space
On Hardy-Hilbert's integral inequality with parameters.
On homomorphisms of projective lattices in complex Hilbert spaces
On mappings, orthogonally additive in the Birkhoff-James sense.
On orthogonally additive mappings.
On orthogonally additive mappings, IV.
On orthogonally additive mappings. (Short Communication).
On quadratic forms.