  This version corrects an inportant typographical error in Eq. 17. COMMENTS,
FOR THE RECORD: A referees reoprt from Phys. Rev. Lett. read in part ``The
first named author has appreciated my exceptionally long report. He has read
and well assimilated the literature I suggested. Congratulations! This very new
version of the manuscript has now three authors and carries a very well chosen
title. Indeed Bargmann, Wightman and Wigner had studied, this subject forty
years ago, in an unpublished book (several chapters were distributed as
preprints). The authors explain well the scope of their paper. They have made a
thorough construction of a field theory of a non usual Wigner type; that is
completely new and all references are relevant. {\it This paper should be
published.}" Despite the fact that no other report was received, the editors of
Phys. Rev. Lett. rejected this paper.
  D.V.A.
