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 The classification of self-dual codes over Galois rings of length 4 Bull. Korean Math. Soc. 2018 Vol. 55, No. 5, 1371-1387 https://doi.org/10.4134/BKMS.b170791Published online September 30, 2018 Whan-Hyuk Choi Kangwon National University Abstract : The classification of the self-dual codes over Galois rings $GR(p,2)$ and $GR(p^2,2)$ of length 4 is completed for all primes $p$ up to equivalence in terms of automorphism group. We obtain all inequivalent classes and the number of each classes of self-dual codes for all primes. Keywords : self-dual codes, classification, Galois ring, mass formula MSC numbers : 94B05 Full-Text :