@article{MTMT:2385737,
	title = {On the nonnegativity of operator products},
	url = {https://m2.mtmt.hu/api/publication/2385737},
	author = {Hassi, S and Sebestyén, Zoltán and De Snoo, HSV},
	doi = {10.1007/s10474-005-0231-x},
	journal-iso = {ACTA MATH HUNG},
	journal = {ACTA MATHEMATICA HUNGARICA},
	volume = {109},
	unique-id = {2385737},
	issn = {0236-5294},
	abstract = {A bounded, not necessarily everywhere defined, nonnegative operator A in a Hilbert space script h sign is assumed to intertwine in a certain sense two bounded everywhere defined operators B and C. If the range of A is provided with a natural inner product then the operators B and C induce two new operators on the completion space. This construction is used to show the existence of selfadjoint and nonnegative extensions of B*A and C*A. © 2005 Akadémiai Kiadó, Budapest.},
	keywords = {selfadjoint operator; Krein-von Neumann extension; Friedrichs extension; Symmetric operator; Product of operators; Nonnegative operator},
	year = {2005},
	eissn = {1588-2632},
	pages = {1-14}
}

@article{MTMT:2449194,
	title = {Reflection symmetry and symmetrizability of Hilbert space operators},
	url = {https://m2.mtmt.hu/api/publication/2449194},
	author = {Sebestyén, Zoltán and Stochel, Jan},
	doi = {10.1090/S0002-9939-04-07705-6},
	journal-iso = {P AM MATH SOC},
	journal = {PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY},
	volume = {133},
	unique-id = {2449194},
	issn = {0002-9939},
	year = {2005},
	eissn = {1088-6826},
	pages = {1727-1731 (electronic)}
}

@article{MTMT:1049874,
	title = {Generalized Toeplitz operators},
	url = {https://m2.mtmt.hu/api/publication/1049874},
	author = {Kérchy, László},
	journal-iso = {ACTA SCI MATH (SZEGED)},
	journal = {ACTA SCIENTIARUM MATHEMATICARUM (SZEGED)},
	volume = {68},
	unique-id = {1049874},
	issn = {0001-6969},
	year = {2002},
	pages = {373-400}
}

@article{MTMT:3079529,
	title = {Positivity of operator products},
	url = {https://m2.mtmt.hu/api/publication/3079529},
	author = {Sebestyén, Zoltán},
	journal-iso = {ACTA SCI MATH (SZEGED)},
	journal = {ACTA SCIENTIARUM MATHEMATICARUM (SZEGED)},
	volume = {66},
	unique-id = {3079529},
	issn = {0001-6969},
	year = {2000},
	pages = {287-294}
}

@article{MTMT:1049481,
	title = {Operators with regular norm-sequences},
	url = {https://m2.mtmt.hu/api/publication/1049481},
	author = {Kérchy, László},
	journal-iso = {ACTA SCI MATH (SZEGED)},
	journal = {ACTA SCIENTIARUM MATHEMATICARUM (SZEGED)},
	volume = {63},
	unique-id = {1049481},
	issn = {0001-6969},
	year = {1997},
	pages = {571-605}
}

@article{MTMT:3079731,
	title = {Operator extensions on Hilbert space},
	url = {https://m2.mtmt.hu/api/publication/3079731},
	author = {Sebestyén, Zoltán},
	journal-iso = {ACTA SCI MATH (SZEGED)},
	journal = {ACTA SCIENTIARUM MATHEMATICARUM (SZEGED)},
	volume = {57},
	unique-id = {3079731},
	issn = {0001-6969},
	year = {1993},
	pages = {233-248}
}

@article{MTMT:1048794,
	title = {Isometric asymptotes of power bounded operators},
	url = {https://m2.mtmt.hu/api/publication/1048794},
	author = {Kérchy, László},
	doi = {10.1512/iumj.1989.38.38008},
	journal-iso = {INDIANA U MATH J},
	journal = {INDIANA UNIVERSITY MATHEMATICS JOURNAL},
	volume = {38},
	unique-id = {1048794},
	issn = {0022-2518},
	year = {1989},
	eissn = {1943-5258},
	pages = {173-188}
}

@article{MTMT:3066108,
	title = {ON RANGES OF ADJOINT OPERATORS IN HILBERT-SPACE},
	url = {https://m2.mtmt.hu/api/publication/3066108},
	author = {Sebestyén, Zoltán},
	journal-iso = {ACTA SCI MATH (SZEGED)},
	journal = {ACTA SCIENTIARUM MATHEMATICARUM (SZEGED)},
	volume = {46},
	unique-id = {3066108},
	issn = {0001-6969},
	year = {1983},
	pages = {295-298}
}