Longobardi, A., Arnaboldi, M., Gerhard, O., & Mihos, J. C. (2015). The build-up of the cD halo of M 87: evidence for accretion in the last Gyr. Astronomy & Astrophysics, 579: L3, pp. 1-4. doi:10.1051/0004-6361/201526282.