1. H. Östmark, Personal communication, based on paper 06 presented at the Polynitrogen Workshop, Los Angeles, CA, United States, September 15, 2006.
2. Single-bonded cubic form of nitrogen
3. N5+: A Novel Homoleptic Polynitrogen Ion as a High Energy Density Material
4. Ueber Stickstoffwasserstoffsäure (Azoimid) N
3
H
5. W. J. Lauderdale, W. A. Sowell, Proceedings of the High Energy Density Matter (HEDM) Conference, Air Force Astronautics Laboratory, Report AFAL CP-87-002, September, 1987, and subsequent reports.