@article{paperid:1074155,
author = {Wei Luo and Sal Moslehian, Mohammad and Qingxiang Xu},
title = {Halmos' two projections theorem for Hilbert C⁎-module operators and the Friedrichs angle of two closed submodules},
journal = {Linear Algebra and its Applications},
year = {2019},
volume = {577},
month = {September},
issn = {0024-3795},
pages = {134--158},
			numpages = {24},
keywords = {Hilbert C∗-module
Orthogonal complement
Halmos’ two projections theorem
Friedrichs angle},
}