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2. A. Abragam, Nuclear Magnetism [Russian translation], Inostrannaya Literatura, Moscow (1964).
3. A. Lesche, Nuclear Induction [Russian translation], Inostrannaya Literatura. Moscow (1964).
4. A. I. Zhernovoi, Nuclear-Magnetic Flowmeter [in Russian], Mashinostroenie, Leningrad (1985).
5. N. L. Egorov, V. V. Ekaterinin, and O. V. Stakhov, NMR Flowmeters [in Russian], Nauka, Alma-Ata (1978).