Geodesic
The Boltzmann–Grad limit for equilibrium states of systems of hard spheres in framework of canonical ensemble
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 4 (1997) no. 1 
The Boltzmann–Grad limit for equilibrium states of systems of hard spheres in framework of canonical ensemble. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 4 (1997) no. 1. http://geodesic.mathdoc.fr/item/JMAG_1997_4_1_a7/
@misc{JMAG_1997_4_1_a7,
     title = {The {Boltzmann{\textendash}Grad} limit for equilibrium states of systems of hard spheres in framework of canonical ensemble},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     year = {1997},
     volume = {4},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_1997_4_1_a7/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

The existence of the Boltzmann--Grad limit is proved for equilibrium states of infinite systems of hard spheres for different normalization of distribution functions.