*1 code is constructed in:
J.H. Conway and N.J.A. Sloane, "A new upper bound on the minimum
distance of self-dual codes", IEEE Trans. Inform. Theory,
36, (1990), p. 1319-1333.
* 1 code is constructed in:
P. Gaborit and A. Otmani, "Experimental constructions of
self-dual codes", preprint