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In this paper we obtain a number of [70,35,12] singly even self-dual codes asa quasi-cyclic codes with m=2 (tailbitting convolutional codes). One of them isthe first known code with parameters Beta=140 Gamma=0. All codes are not puredouble circulant i.e. could not be represented in systematic form.

Quasi-cyclic self-dual codes of length 70