On the classification of $\mathbb{Z}_4$-codes
Makoto Araya, Masaaki Harada, Hiroki Ito, Ken Saito · Advances in Mathematics of Communications · 2017
In this note, we study the classification of $\mathbb{Z}_4$ -codes. For some special cases $(k_1,k_2)$ , by hand, we give a classification of $\mathbb{Z}_4$ -codes of length $n$ and type $4^{k_1}2^{k_2}$ satisfying a certain condition. Our exhaustive computer search completes the classification of $\mathbb{Z}_4$ -codes of lengths up to $7$ .