  Additive one-weight codes over a finite field of non-prime order are
equivalent to special subspace coverings of the points of projective space,
which we call multispreads. The current paper is devoted to the
characterization of the parameters of multispreads, which is equivalent to the
characterization of the parameters of additive one-weight codes. We
characterize these parameters for the case of the prime-square order of the
field and make a partial characterization for the prime-cube case and the case
of the fourth degree of a prime (including a complete characterization for
orders 8, 27, and 16).
