%0 Journal Article
%A et EHT Collaboration al.
%B ApJL
%D 2021
%G eng
%N L12
%P 48
%T First M87 Event Horizon Telescope Results. VII. Polarization of the Ring
%U https://iopscience.iop.org/article/10.3847/2041-8213/abe71d
%V 910