Посилання:On Spaces of Boundary Values for Relations Generated by a Formally Selfadjoint Expression and a Nonnegative Operator Function / V.M. Bruk // Журнал математической физики, анализа, геометрии. — 2006. — Т. 2, № 3. — С. 268-277. — Бібліогр.: 11 назв. — англ.
The space of boundary values for a maximal relation generated by a formally selfadjoint di erential expression and a nonnegative operator function is constructed.