Database of selfdual codes over integers modulo 4
Data files are in Magma format.
Magma programs
 checking equivalence
 checking mass formula (for lengths up to 20)
 extracting codes from a lattice
References
 E. Bannai, S.T. Dougherty, M. Harada and M. Oura, Type II codes, even unimodular lattices, and invariant rings, IEEE Trans. Inform. Theory 45 (1999), 11941205.
 J.H. Conway and N.J.A. Sloane, Selfdual codes over the integers modulo 4, J. Combin. Theory Ser.A 62 (1993), 3045.
 J. Fields, P. Gaborit, J.S. Leon and V. Pless, All selfdual Z_4 codes of length 15 or less are known, IEEE Trans. Inform. Theory 44 (1998), 311322.
 P. Gaborit, Mass formulas for selfdual codes over Z_4 and F_q+uF_q rings, IEEE Trans. Inform. Theory 42 (1996), 12221228.

M. Harada and A. Munemasa,
On the classification of selfdual Z_kcodes,
Cryptography and coding, 7890,
Lecture Notes in Comput. Sci., 5921, Springer, Berlin, 2009.
 V. Pless, J.S. Leon and J. Fields, All Z_4 codes of Type II and length 16 are known, J. Combin. Theory Ser.A 78 (1997), 3250.
 E. Rains, Optimal selfdual codes over Z_4, Discrete Math. 203 (1999), 215228.
 E. Rains and N.J.A. Sloane, Selfdual codes, in Handbook of Coding Theory, V.S. Pless and W.C. Huffman (Editors), Elsevier, Amsterdam 1998, pp. 177294.
Links

Vera Pless
"Indecomposable Z/(4) Codes (for codes of smaller lengths)"
 Markus Grassl
"Bounds on the minimum distance of linear codes"
http://www.codetables.de
 Philippe Gaborit and Ayoub Otmani
"Tables of selfdual codes"

N.J.A. Sloane,
"A library of linear (and nonlinear) codes
"
Created May 24, 2009 by Masaaki Harada and Akihiro Munemasa
Last modified October 16, 2018.