no. 4
Strict positivity of the solution to a 2-dimensional spatially homogeneous Boltzmann equation without cutoff
Annales de l'I.H.P. Probabilités et statistiques, Tome 37 (2001) no. 4, pp. 481-502 
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     author = {Fournier, Nicolas},
     title = {Strict positivity of the solution to a $2$-dimensional spatially homogeneous {Boltzmann} equation without cutoff},
     journal = {Annales de l'I.H.P. Probabilit\'es et statistiques},
     pages = {481--502},
     year = {2001},
     publisher = {Elsevier},
     volume = {37},
     number = {4},
     mrnumber = {1876840},
     zbl = {0981.60056},
     language = {en},
     url = {https://www.numdam.org/item/AIHPB_2001__37_4_481_0/}
}
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Fournier, Nicolas. Strict positivity of the solution to a $2$-dimensional spatially homogeneous Boltzmann equation without cutoff. Annales de l'I.H.P. Probabilités et statistiques, Tome 37 (2001) no. 4, pp. 481-502. https://www.numdam.org/item/AIHPB_2001__37_4_481_0/

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