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Collisional diffusion in long-mean-free-path, geometrically nonsymmetric regimes is characterized by Bohm-like scaling laws. A variational principle is found for calculation of diffusion constants.Received 3 February 1969DOI:https://doi.org/10.1103/PhysRevLett.22.511©1969 American Physical Society
Galeev et al. (1969) studied this question.