Relativistic Spin-Flavor States in Light Front Dynamics
  Orthonormal spin-flavor wave functions of Lorentz covariant quark models of the Bakamjian-Thomas type are constructed for nucleon resonances. Three different bases are presented. The manifestly Lorentz covariant Dirac-Melosh basis is related to the Pauli-Melosh basis and the symmetrized Bargmann-Wigner basis that are manifestly orthogonal. 
M. Beyer, C. Kuhrts (U. Rostock), H. J. Weber (U.Va)