Steven T. Dougherty T. Aaron Gulliver Manabu Oura Higher Weights and Graded Rings for Binary Self-dual Codes. 121-143 2003 128 Discrete Applied Mathematics 1 http://dx.doi.org/10.1016/S0166-218X(02)00440-7 db/journals/dam/dam128.html#DoughertyGO03