R. R. Varshamov

A class of codes for asymmetric channels and a problem from the additive theory of numbers

R. R. Varshamov, R. Varshamov, 1973, IEEE Trans. Inf. Theory.

A General Method of Constructing Asymmetric Coding Systems, Related to the Solution of a Combinatorial Problem Proposed by Dixon

R. R. Varshamov, 1971 .

On the Theory of Asymmetric Codes

R. R. Varshamov, R. Varshamov, 1966 .