Pudovkma M. A., Pogorelov B.A. «⊗W, ch-markovian transformations» // Applied Discrete Mathematics. Supplement 2015. №8 C.17-19
Pudovkina M. A., Pogorelov B. A. «On nonabelian key addition groups and markovian block ciphers» // Applied Discrete Mathematics. Supplement 2018. №11 C.79-81