On the conjugacy classes of involutions of the unitary groups...
Dye, R. H. (1973) On the conjugacy classes of involutions of the unitary groups Um (K), SUm(K), PUm(K), PSUm(K) over perfect fields of characteristic 2. J. Algebra 24: pp. 453-459Dye, R.H.: On the conjugacy classes of involutions of the u...