van den Hoek, L. B., Goudfrooy, P., Hansen, L., Jorgensen, H. F., Norgaard-Nielsen, H. U., & de Jong, T. (1994). Interstellar matter in Shapley-Ames elliptical galaxies. I. Multi-colour CCD surface photometry. Astronomy and Astrophysics Supplement Series, 104, 179-231.