Erwin, Peter Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;
Beckman, J. E., Erwin, P., Pohlen, M., Gutierrez, L., Aladro, R., & Trujillo, I. (2008). The external zones of spiral galaxies: truncations, no truncations and antitruncations. In K. Wada, & F. Combes (Eds.), Mapping the Galaxy and Nearby Galaxies (pp. 310). New York: Springer.