Piran, T. (1994). Gerald J. Fishman (ed.). Fireballs. in Proceedings of the 2nd Workshop held in Huntsville, Alabama, October 1993, New York: American Institute of Physics (AIP), AIP Conference Proceedings. Vol. 307. p. 495. Bibcode:1994AIPC..307..495P. doi:10.1063/1.45856.
Piran, T. (1994). Gerald J. Fishman (ed.). Fireballs. in Proceedings of the 2nd Workshop held in Huntsville, Alabama, October 1993, New York: American Institute of Physics (AIP), AIP Conference Proceedings. Vol. 307. p. 495. Bibcode:1994AIPC..307..495P. doi:10.1063/1.45856.