Properties and evolution of anisotropic structures in collisionless   plasmas
  A new class of exact electrostatic solutions of the Vlasov-Maxwell equations based on the Jeans's theorem is proposed for studying the evolution and properties of two-dimensional anisotropic plasmas that are far from thermodynamic equilibrium. In particular, the free expansion of a slab of electron-ion plasma into vacuum is investigated. 
A.R. Karimov, M.Y. Yu and L. Stenflo
physics.plasm-ph physics.class-ph