Diffusion limit of the simplified Langevin PDF model in weakly inhomogeneous turbulenceCasimir Emako, Viviana Letizia, Nadezda Petrova, Rmi Sainct, Roland Duclous and Olivier SoulardESAIM: Proc., 48 (2015) 400-419DOI: https://doi.org/10.1051/proc/201448019