@article {12818, title = {The Brown-Halmos theorem for a pair of abstract Hardy spaces}, journal = {Journal of Mathematical Analysis and Applications}, volume = {472}, year = {2019}, pages = {246-265}, url = {https://doi.org/10.1016/j.jmaa.2018.11.022}, author = {Karlovich, Alexei and Shargorodsky, Eugene} }