Spektrum dan himpunan resolvent dari operator linear terbatas dan operator linear self adjoint terbatas = Spectrum and resolvent set of bounded linear operators and bounded self adjoint linear operators

Linear operators part 2: spectral theory, self adjoint operators in Hilbert space

The adjoint of a semigroup of linear operators / Jan van Neerven

Unbounded self-adjoint operators on Hilbert space

Spectral theory of linear operators