1. Bowyer, S., Berghofer, T. W. & Korpela, E. 1999, in Diffuse Thermal and Relativistic Plasma in Galaxy Clusters, ed. H. Bohringer, L. Feretti, & P. Schuecker (MPE Rep. 271; Garching: MPE), 201
2. Colgate, S. A. & Li, H. 2000, in IAU Symp. 195, Highly Energetic Physical Processes and Mechanisms for Emision from Astrophysical Plasmas, ed. P. C. H. Martens & S. Tsuruta (San Francisco: ASP), 255
3. The NRAO VLA Sky Survey
4. Dogiel, V. A. 1999, in Diffuse Thermal and Relativistic Plasma in Galaxy Clusters, ed. H. Bohringer, L. Feretti, & P. Schuecker (MPE Rep. 271; Garching: MPE), 259