1. E.E. Hamel, R.E. Olsen, US Patent 3,428,667 (18 February 1969).
2. J.C. Bottaro, R.J. Schmidt, P.E. Penwell, D.S. Ross, US Patent 5,198,204.
3. J.C. Bottaro, R.J. Schmidt, P.E. Penwell, D.S. Ross, US Patent 5,254,324.
4. R.J. Schmidt, J.C. Bottaro, P.E. Penwell, D.C. Bomberger, US Patent 5,316,749.
5. A new synthesis of alkyl-N,N-dinitramines by direct nitration of isocyanates;Bottaro;Synth. Commun.,1991