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V. A. Steklov Mathematics Institute, USSR Academy of Sciences. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 62, No. 1, pp. 3–29, January, 1985.
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Vladimirov, V.S., Volovich, I.V. Local and nonlocal currents for nonlinear equations. Theor Math Phys 62, 1–20 (1985). https://doi.org/10.1007/BF01034820
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DOI: https://doi.org/10.1007/BF01034820