Taĭnopisʹ v istorii Rossii : istorii︠a︡ kriptograficheskoĭ sluzhby Rossii, XVIII-nachala XX v. /
Soboleva, T. A.(Tatʹi︠a︡na Alekseevna)
Moskva : "Mezhdunarodnye otnoshenii︠a︡",
1994.
Includes bibliographical references (p. 374-[380]).
Cryptography