Geodesic
Normal extensions of a singular differential operator on the right semi-axis
Eurasian mathematical journal, Tome 5 (2014) no. 3, pp. 117-124

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In this work, based on the method of Everitt–Zettl and using the Calkin–Gorbachuk method, all normal extensions of the minimal operator generated by a linear singular formally normal differential-operator expression of the first order in Hilbert spaces of vector-functions on the right semi-axis in terms of boundary values are described. Furthermore, the structure of the spectrum of these extensions is investigated. 
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Z. I. Ismailov; R. Öztürk Mert. Normal extensions of a singular differential operator on the right semi-axis. Eurasian mathematical journal, Tome 5 (2014) no. 3, pp. 117-124. http://geodesic.mathdoc.fr/item/EMJ_2014_5_3_a7/