@article{articlec37b719a,
title   = {Discovery of an H 'alfa' emitting disk around the supermassive black hole of M31},
author = {Menezes, R.B and Steiner, João Evangelista and Ricci, T. V},
year = {2013},
doi = {10.1088/2041-8205/762/2/L29},
journal   = {The Astrophysical Journal Letters}
}