@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}
}

@article{MTMT:2853826,
	title = {A reversed von Neumann theorem},
	url = {https://m2.mtmt.hu/api/publication/2853826},
	author = {Sebestyén, Zoltán and Tarcsay, Zsigmond},
	doi = {10.14232/actasm-013-283-x},
	journal-iso = {ACTA SCI MATH (SZEGED)},
	journal = {ACTA SCIENTIARUM MATHEMATICARUM (SZEGED)},
	volume = {80},
	unique-id = {2853826},
	issn = {0001-6969},
	year = {2014},
	pages = {659-664},
	orcid-numbers = {Tarcsay, Zsigmond/0000-0001-8102-5055}
}