TY - JOUR A1 - C.-K. Chan A1 - D. Psaltis A1 - F. Özel AU - BT - ApJ IS - 1 LA - eng PY - 2013 EP - 13 T1 - GRay: A Massively Parallel GPU-based Code for Ray Tracing in Relativistic Spacetimes T2 - ApJ TI - GRay: A Massively Parallel GPU-based Code for Ray Tracing in Relativistic Spacetimes VL - 777 Y1 - 2013 ER -