Ratseev S. M. «About perfect imitation resistant ciphers» // 2012. №3(17) C.41-46
Ratseev S. M. «Conditions for the existence of perfect ciphers with a fixed set of parameters» // Applied Discrete Mathematics 2014. №7 (Приложение) C.54-56
Ratseev S. M. «Conditions for the existence of perfect ciphers with a fixed set of parameters» // 2014. №7 C.54-56
