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2. Algebraic Coding Theory;Berlekamp,1968
3. A group of order 8, 315, 553, 613, 086, 720;Conway;Bull. London Math. Soc.,1969
4. Conway, J. H. (1969b), unpublished communication.
5. On the Golay perfect binary code;Goethals;J. Combinatorial Theory,1971