The concatenated structure of quasi-abelian codes

On the algebraic structure of quasi group codes

“…. , π s are known (see [6]). In [1], the authors consider the dihedral group in the binary case, describing explicitly the blocks in some cases.…”

“…Remark 5.5. The ternary [12,6,6] 3 self-dual extended Golay code is not a group code. But it is a self-dual quasi group code of index ℓ = 4 for a cyclic group of order 3.…”