@article{JRAM_1981__326_152379,
     author = {J\"urgen Voigt},
     title = {The {H-theorem} for {Boltzmann} type equations.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {198--213},
     publisher = {mathdoc},
     volume = {326},
     year = {1981},
     zbl = {0451.34060},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1981__326_152379/}
}