In this paper the author gives a canonical form of a closed operator commuting
with an resolution of identity (of infinite multiplicity) on a Hilbert
space and proves the existence of a full system of generalized eigenfunctions
for a related spectral operator.
Citation Example:Lyantse V. É. Unbounded operators commuting with an resolution of
identity // Ukr. Mat. Zh. - 1963. - 15, № 4. - pp. 376-385.