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Medvedeva N. V., Titov S. S. «On non-minimal perfect ciphers» // 2013. №6 C.42-44
Titov Sergey S., Medvedeva Natalya V. «Description of non-endomorphic maximum perfect ciphers with two-valued plaintext alphabet» // Applied Discrete Mathematics 2015. №4(30) C.43-55
Medvedeva N. V., Titov S. S. «Constructions of non-endomorphic perfect ciphers» // Applied Discrete Mathematics. Supplement 2020. №13 C.51-54
Titov Sergey S., Medvedeva Natalia A. «The criterion of minimum perfect ciphers with respect to inclusion» // Applied Discrete Mathematics. Supplement 2022. №15 C.51-54
Titov S. S., Medvedeva N. V. «Non-endomorphic perfect ciphers with two elements in plaintext alphabet» // Applied Discrete Mathematics. Supplement 2015. №8 C.63-66
Titov S. S., Medvedeva N. V. «To the task of description minimal by inclusion perfect ciphers» // Applied Discrete Mathematics. Supplement 2021. №14 C.91-95
Medvedeva N. V., Titov S. S. «Geometric model of perfect ciphers with three cipher plaintext values» // Applied Discrete Mathematics. Supplement 2019. №12 C.113-116
