Marisaldi, M., Galli, M., Labanti, C., Østgaard, N., Sarria, D., Cummer, S. A., et al. (2019), On the high-energy spectral component and fine time structure of terrestrial gamma ray flashes, J. Geophys. Res.: Atmospheres, 124, doi.org/10.1029/2019JD030554 (pdf)