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3. Z. I. Abarbanel' and I. Ya. Viner, Izv. Vyssh. Uchebn. Zaved., Fiz., No. 5 (1969).
4. S. E. Savitskii, V. I. Urodov, Z. I. Abarbanel', and S. G. Kovchur, Investigation of Polydisperse Systems by Physical Methods [in Russian], Izd. BGU, Minsk (1971).
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