1. K.E. Carr, Intercalation and oxidation effects on graphite of a mixture of sulphuric and nitric acids // Carbon, Volume 8, Issue 2, March 1970, Pages 155-158, IN11-IN16, 159-166.
- DOI:
http://dx.doi.org/10.1016/0008-6223(70)90110-7
- DOI:
http://dx.doi.org/10.1016/S0008-6223(97)88096-7