Mert, Rukiye ÖztürkYılmaz, BülentIsmaılov, Zameddin I.2021-11-012021-11-0120191303-59912618-6470https://doi.org10.31801/cfsuasmas.501414https://app.trdizin.gov.tr/makale/TXpjNE1UWTRPQT09https://hdl.handle.net/11491/7573In the present paper, the aim is to described all selfadjoint extensions of the minimal operator generated by Örst order linear symmetric multipoint quasi-di§erential operator expression in the direct sum of weighted Hilbert spaces of vector-functions deÖned at the semi-inÖnite intervals by using the Calkin-Gorbachuk method. We have also examine the structure of the spectrum of such extensions.eninfo:eu-repo/semantics/openAccess[No Keywords]Article68196497210.31801/cfsuasmas.501414N/AWOS:000463698900081