Geodesic
Relativistic Wigner Function and Nonlinear Representations of the Lorentz Group
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Problems of the modern mathematical physics, Tome 228 (2000), pp. 136-144.

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A generalization of the Wigner Function for the case of particles with relativistic Hamiltonian $H(\mathbf p)=\sqrt{\mathbf p^2+m^2}$ is given; the transformation properties of the wave functions with respect to the Lorentz group are discussed. 
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O. I. Zavialov. Relativistic Wigner Function and Nonlinear Representations of the Lorentz Group. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Problems of the modern mathematical physics, Tome 228 (2000), pp. 136-144. http://geodesic.mathdoc.fr/item/TM_2000_228_a10/

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