1. Bannai, E., Dougherty, S.T., Harada, M., Oura, M.: Type II codes, even unimodular lattices and invariant rings, IEEE Trans. Inform. Theory 45, 257–269 (1999)
2. Conway, J.H., Pless, V., Sloane, N.J.A.: Self-dual codes over GF(3) and GF(4) of length not exceeding 16, IEEE Trans. Inform. Theory 25, 312–322 (1979)
3. Conway, J.H., Sloane, N.J.A.: A note on optimal unimodular lattices, J. Number Theory 72, 357–362 (1998)
4. Conway, J.H., Sloane, N.J.A.: Sphere Packing, Lattices and Groups, 3rd ed., Springer, New York, 1999
5. Gaborit, P.: Construction of new extremal unimodular lattices. Eur. J. Combin. 25, 549–564 (2004)