@article{paperid:1074330,
author = {Mohsen Kian and Qingxiang Xu},
title = {Positivity of $2\times 2$ block matrices of operators},
journal = {Banach Journal of Mathematical Analysis},
year = {2019},
volume = {13},
number = {3},
month = {July},
issn = {1735-8787},
pages = {726--743},
			numpages = {17},
keywords = {positive operator‎; ‎block matrix‎; ‎Hilbert space},
}