ROCKY MOUNTAIN JOURNAL OF MATHEMATICS, vol.42, no.2, pp.633-642, 2012 (SCI-Expanded)
In this work, in terms of boundary values all normal extensions of a class of formally normal minimal operators, generated by a linear differential-operator expression of first-order with smooth operator coefficients are described in Hilbert space of vector-functions in a finite interval. The structure of the spectrum of the normal extensions is investigated.