Middleton, M. J., Miller-Jones, J. C., Markoff, S., Fender, R., Henze, M., Hurley-Walker, N., …Grainge, K. (2013). Bright radio emission from an ultraluminous stellar-mass microquasar in M 31. Nature, 493(7431), 187-190. https://doi.org/10.1038/nature11697