1. Briceno, M., I. Goldberg, and D. Wagner. 1998. GSM cloning. http://www.isaac.cs.berkeley.edu/isaac/gsm-faq.html. Retrieved on 26 July 2013.
2. Courtois, N., G. Castagnos, and L. Goubin. What do DES S-boxes say to each other? eprint.iacr.org/2003/184/.
3. Security Evaluation of GOST 28147-89 in View of International Standardisation
4. Courtois, N. T. Cryptanalysis of GOST. a very long extended set of slides about the cryptanalysis of GOST, 2010–2014, http://www.nicolascourtois.com/papers/GOST.pdf. An earlier and shorter version was presented at 29C3, Dec 2012, Hamburg, Germany.