Pierini, D. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Hunt, L. K., Pierini, D., & Giovanardi, C. (2004). Near-infrared observations of galaxies in Pisces-Perseus. V. On the origin of bulges. Astronomy & Astrophysics, 414(3), 905-918. doi:10.1051/0004-6361:20031679.