1. Alfvén, H., , Cosmic Plasma, Kluwer Boston, Hingham, Mass., 1981,
2. Collisionless plasma expansion into a vacuum;Denavit;Phys. Fluids,1979
3. Draper, N. R., , H., Smith, , Applied Regression Analysis, John Wiley, New York, 1966,
4. Self-similar motion of rarefied plasma;Gurevich;Sov. Phys. JETP Engl. Transl.,1966
5. Ion acceleration upon expansion of a rarefied plasma;Gurevich;Sov. Phys. JETP Engl. Transl.,1973