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 
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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     author = {O. I. Zavialov},
     title = {Relativistic {Wigner} {Function} and {Nonlinear} {Representations} of the {Lorentz} {Group}},
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     pages = {136--144},
     year = {2000},
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     url = {http://geodesic.mathdoc.fr/item/TM_2000_228_a10/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

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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