1. Volchikhin, V.I., Ivanov, A.I., Funtikov, V.A. (2005). Fast learning algorithms for neural network mechanisms of biometric-cryptographic information protection. Publishing House of the Penza State University, Penza.;
2. Malygin, A.Yu., Volchikhin, V.I., Ivanov, A.I., Funtikov, V.A. (2006). Fast testing algorithms for neural network mechanisms of biometric-cryptographic information protection. Publishing House of the Penza State University, Penza.;
3. Yazov, Yu.K. (2012). Neural network protection of personal biometric data. Radio Engineering, Moscow.;
4. Federal Agency on Technical Regulating and Metrology. (2001). R 50.1.037-2002. Recommendations on standardization. Applied statistics. Rules for verifying the agreement between the experimental and the theoretical distributions. Part I. x2 type criteria.;
5. Serikova, N.I., Ivanov, A.I., Kachalin, S.V. (2014). Biometric stats: smoothing histograms based on small training sample. Scientific Journal of Science and Technology, vol. 3, no. 55, 146-150.;