Christine Bachoc Philippe Gaborit On Extremal Additive <i>I</i><sub>4</sub> Codes of Length 10 to 18. 55-64 2001 6 Electronic Notes in Discrete Mathematics http://dx.doi.org/10.1016/S1571-0653(04)00157-X db/journals/endm/endm6.html#BachocG01