Welsh, D. (1988). Codes and cryptography. Oxford [Oxfordshire] : New York: Clarendon Press ; Oxford University Press.
Trích dẫn kiểu ChicagoWelsh, Dominic. Codes and Cryptography. Oxford [Oxfordshire] : New York: Clarendon Press ; Oxford University Press, 1988.
Deismireacht MLAWelsh, Dominic. Codes and Cryptography. Oxford [Oxfordshire] : New York: Clarendon Press ; Oxford University Press, 1988.
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