1. H. Betz, “Charge states and charge-changing cross section of fast heavy ions penetrating through gaseous and solid media,” Rev. Mod. Phys.,44, No. 3, 465–539 (1972).
2. N. Lassen. “Total charges of fission fragments as a function of the pressure of the stopping gas.” Math.-Fyz. Medd. Kgl. Danske Vid. Selskab,26, No. 12, (1951).
3. N. Lassen, “The total charges of fission fragments in gaseous and solid stopping media,” ibid.Math.-Fyz. Medd. Kgl. Danske Vid. Selskab,26, No. 5(1951).
4. C. Fulmer and B. Cohen, “Equilibrium charges of fission fragments in gases,” Phys. Rev.,109, No. 1, 94–99 (1957).
5. A. P. Budnik, O. N. Katsuro, and Yu. V. Sokolov, “Description of the stopping power of inert gases for fission fragments in the classical theory of binary collisions,” Preprint No. FÉI-2495, Physics and Power Engineering Institute (1996).