Geodesic
Asymptotics of the solutions to the $N$-particle Kolmogorov-Feller equations and the asymptotics of the solution to the Boltzmann equation in the region of large
Matematičeskie zametki, Tome 58 (1995) no. 5, pp. 694-709

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We construct a representation in which the asymptotics of the solution to the Kolmogorov–Feller equation in the Fock space $\Gamma\bigl(L_1(\mathbb R^n)\bigr)$ is of a form similar to the WKB asymptotic expansion; namely, the Boltzmann equation in $L_1(\mathbb R^n)$ plays the role of the Hamilton equations, the linearized Boltzmann equation extended to $\Gamma\bigl(L_1(\mathbb R^n)\bigr)$ plays the role of the transport equation, and the Hamilton–Jacobi equation follows from the conservation of the total probability for the solutions of the Boltzmann equation. We also construct the asymptotics of the solution to the Boltzmann equation with small transfer of momentum; this asymptotics is given by the tunnel canonical operator corresponding to the self-consistent characteristic equation. 
@article{MZM_1995_58_5_a4,
     author = {V. P. Maslov},
     title = {Asymptotics of the solutions to the $N$-particle {Kolmogorov-Feller} equations and the asymptotics of the solution to the {Boltzmann} equation in the region of large},
     journal = {Matemati\v{c}eskie zametki},
     pages = {694--709},
     publisher = {mathdoc},
     volume = {58},
     number = {5},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1995_58_5_a4/}
}
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V. P. Maslov. Asymptotics of the solutions to the $N$-particle Kolmogorov-Feller equations and the asymptotics of the solution to the Boltzmann equation in the region of large. Matematičeskie zametki, Tome 58 (1995) no. 5, pp. 694-709. http://geodesic.mathdoc.fr/item/MZM_1995_58_5_a4/