A remark on symplectic semifield planes and Z_4-linear codes

In [7] W.M. Kantor and M.E. Williams introduced a family of non- desarguesian symplectic semifields of even order and studied a number of structures connected with such semifields; namely, symplectic spreads, orthogonal spreads and Z4−linear codes. Also, they provided equivalence results concerning such objects, although under certain field restrictions. In this article we will succeed in removing such hypotheses