@article{MTMT:32083562,
	title = {Adjoint to each other linear relations. Nieminen type criteria},
	url = {https://m2.mtmt.hu/api/publication/32083562},
	author = {Roman, Marcel and Sandovici, Adrian},
	doi = {10.1007/s00605-021-01579-9},
	journal-iso = {MONATSH MATH},
	journal = {MONATSHEFTE FUR MATHEMATIK},
	unique-id = {32083562},
	issn = {0026-9255},
	year = {2021},
	eissn = {1436-5081}
}

@article{MTMT:31325292,
	title = {On the Adjoint of Linear Relations in Hilbert Spaces},
	url = {https://m2.mtmt.hu/api/publication/31325292},
	author = {Sandovici, Adrian},
	doi = {10.1007/s00009-020-1503-y},
	journal-iso = {MEDITERR J MATH},
	journal = {MEDITERRANEAN JOURNAL OF MATHEMATICS},
	volume = {17},
	unique-id = {31325292},
	issn = {1660-5446},
	year = {2020},
	eissn = {1660-5454}
}

@misc{MTMT:32083554,
	title = {Unbounded operators having self-adjoint or normal powers and some related results},
	url = {https://m2.mtmt.hu/api/publication/32083554},
	author = {Souheyb, Dehimi and Mohammed, Hichem Mortad},
	unique-id = {32083554},
	year = {2020}
}

@article{MTMT:31089104,
	title = {THE SQUARE ROOT OF NONNEGATIVE SELFADJOINT LINEAR RELATIONS IN HILBERT SPACES},
	url = {https://m2.mtmt.hu/api/publication/31089104},
	author = {Roman, Marcel and Sandovici, Adrian},
	doi = {10.7900/jot.2018may24.2226},
	journal-iso = {J OPERAT THEOR},
	journal = {JOURNAL OF OPERATOR THEORY},
	volume = {82},
	unique-id = {31089104},
	issn = {0379-4024},
	abstract = {An elementary construction of the square root of nonnegative selfadjoint linear relations in Hilbert spaces is presented.},
	keywords = {Hilbert space; SQUARE ROOT; Nonnegative linear relation; Selfadjoint linear relation},
	year = {2019},
	eissn = {1841-7744},
	pages = {357-367}
}

@article{MTMT:30440389,
	title = {A range matrix-type criterion for the self-adjointness of symmetric linear relations},
	url = {https://m2.mtmt.hu/api/publication/30440389},
	author = {Sandovici, A.},
	doi = {10.1007/s10474-018-0883-y},
	journal-iso = {ACTA MATH HUNG},
	journal = {ACTA MATHEMATICA HUNGARICA},
	volume = {158},
	unique-id = {30440389},
	issn = {0236-5294},
	abstract = {The main objective of this paper is to provide a range-type criterion for the self-adjointness of symmetric linear relations in real or complex Hilbert spaces. The main used ingredient is a matrix whose entries are certain linear relations.},
	year = {2019},
	eissn = {1588-2632},
	pages = {27-35}
}

@article{MTMT:30440374,
	title = {Self-adjointness and skew-adjointness criteria involving powers of linear relations},
	url = {https://m2.mtmt.hu/api/publication/30440374},
	author = {Sandovici, Adrian},
	doi = {10.1016/j.jmaa.2018.09.063},
	journal-iso = {J MATH ANAL APPL},
	journal = {JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS},
	volume = {470},
	unique-id = {30440374},
	issn = {0022-247X},
	abstract = {The main objective of this paper is to provide range-type criteria for the self-adjointness of symmetric linear relations and for the skew-adjointness of skew-symmetric linear relations in real or complex Hilbert spaces, respectively. These range-type criteria involve powers of linear relations.},
	keywords = {Hilbert space; Symmetric linear relation; Nonnegative linear relation; Selfadjoint linear relation; Skew-symmetric linear relation; Skew-adjoint linear relation},
	year = {2019},
	eissn = {1096-0813},
	pages = {186-200}
}

@article{MTMT:30446535,
	title = {On the adjoint of Hilbert space operators},
	url = {https://m2.mtmt.hu/api/publication/30446535},
	author = {Sebestyén, Zoltán and Tarcsay, Zsigmond},
	doi = {10.1080/03081087.2018.1430120},
	journal-iso = {LINEAR MULTILINEAR A},
	journal = {LINEAR AND MULTILINEAR ALGEBRA},
	volume = {67},
	unique-id = {30446535},
	issn = {0308-1087},
	abstract = {In general, it is a non-trivial task to determine the adjoint S* of an unbounded operator S acting between two Hilbert spaces. We provide necessary and sufficient conditions for a given operator T to be identical with S*. In our considerations, a central role is played by the operator matrix M-S,M-T = (I -T S I). Our approach has several consequences such as characterizations of closed, normal, skew- and selfadjoint, unitary and orthogonal projection operators in real or complex Hilbert spaces. We also give a self-contained proof of the fact that T*T always has a positive selfadjoint extension.},
	keywords = {Positive operator; selfadjoint operator; adjoint; closed operator},
	year = {2019},
	eissn = {1563-5139},
	pages = {625-645},
	orcid-numbers = {Tarcsay, Zsigmond/0000-0001-8102-5055}
}

@article{MTMT:3293570,
	title = {On the square root of a positive selfadjoint operator},
	url = {https://m2.mtmt.hu/api/publication/3293570},
	author = {Sebestyén, Zoltán and Tarcsay, Zsigmond},
	doi = {10.1007/s10998-017-0192-1},
	journal-iso = {PERIOD MATH HUNG},
	journal = {PERIODICA MATHEMATICA HUNGARICA},
	volume = {75},
	unique-id = {3293570},
	issn = {0031-5303},
	abstract = {We provide a short, elementary proof of the existence and uniqueness of the square root in the context of unbounded positive selfadjoint operators on real or complex Hilbert spaces.},
	keywords = {SQUARE ROOT; Positive operator; selfadjoint operator; Unbounded operator},
	year = {2017},
	eissn = {1588-2829},
	pages = {268-272},
	orcid-numbers = {Tarcsay, Zsigmond/0000-0001-8102-5055}
}