1. Mazets, E. P., Golenetskii, S. V., Aptekar, R. L., Guryan, Y. A. & Ilyinskii, V. N. Nature 290, 378 (1981).
2. Wheaton, W. A. et al. Astrophys. J. Lett. 185, L57 (1973).
3. Gilman, D., Metzger, A. E., Parker, R. H., Evans, L. G. & Trombka, J. I. Astrophys. J. 236, 951 (1980).
4. Fenimore, E. E., Laros, J. G., Klebesadel, R. W., Stockdale, R. E. & Kane, S. R. Proc. Workshop on Gamma Ray Bursts and Related Transient Phenomenon, UCSD (1981).
5. Woolsey, S. E. Proc. Workshop on Gamma Ray Bursts and Related Transient Phenomenon, UCSD (1981).