Gerhard, O. Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;
Castro-Rodriguez, N., Arnaboldi, M., Aguerri, J. A. L., Gerhard, O., Okamura, S., Yasuda, N., et al. (2009). Intracluster light in the Virgo cluster: large scale distribution. Astronomy & Astrophysics, 507(2), 621-634. doi:10.1051/0004-6361/200809774.