1. Ferguson, C., Lei, F., Dean, A. J., et al. 2001, Exploring the gamma-ray universe, Proc. Fourth INTEGRAL workshop, 4-8 Sep. 2000, Alicante, Spain, ed. B. Battrich, Scient. ed. A. Gimenez, V. Reglero, & C. Winkler, ESA SP-459, 565 (Noordwijk: ESA Publications Division), ISBN 92-9092-677-5
2. Ferguson, C. 2000, Ph.D. Thesis, University of Southampton
3. Roques, J.-P., Schanne, S., von Kienlin, A., et al. 2003, 411, L91