@misc{indiciaee2d4ad4f10dd,
  title = {Variability in shell models of GRBs},
  author = {Sumner, M. C. and Fenimore, E. E.},
  year = {1997},
  url = {https://ntrs.nasa.gov/citations/19990058184},
  note = {Source identifier: 19990058184}
}