TY - JOUR A1 - et O. Porth al. AU - BT - ApJS IS - 26 LA - eng PY - 2019 T1 - The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project T2 - ApJS TI - The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project UR - https://iopscience.iop.org/article/10.3847/1538-4365/ab29fd VL - 243 Y1 - 2019 ER -