1. Arbour, R., Papenkova, M., Li, W. D., Filippenko, A. V. & Armstrong, M. 1999, IAU Circ. 7156
2. Bonanos, A., Garnavich, P., Schlegel, E., Jha, S., Challis, P., Kirshner, R., Hatano, K. & Branch, D. 1999, BAAS, 31, 1024
3. Branch, D. 2001, PASP, 113, 169
4. Branch, D. & Doggett, J. B. 1985, AJ, 90, 2218
5. Branch, D., Fisher, A. & Nugent, P. 1993, AJ, 106, 2383