TY - JOUR A1 - et C.-K. Chan al. AU - BT - ApJ IS - 1 LA - eng PY - 2018 EP - 59 T1 - GRay2: A General Purpose Geodesic Integrator for Kerr Spacetimes T2 - ApJ TI - GRay2: A General Purpose Geodesic Integrator for Kerr Spacetimes VL - 867 Y1 - 2018 ER -