00332nas a2200109   4500000000100000000000100001008004100002100002000043245008700063856006400150490000800214       2019                            d1 aet O. Porth al.00aThe Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project  uhttps://iopscience.iop.org/article/10.3847/1538-4365/ab29fd0 v243