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2. Inventor Certificate No. 497294; Byull. Izobr., No. 48 (1975).
3. E. Stahl, Thin-Layer Chromatography, Springer-Verlag (1969).
4. I. Denesh, Titration in Nonaqueous Media [in Russian], Moscow (1971).
5. State Pharmacopoeia of the USSR, 10th edition [in Russian], Moscow (1968).