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Dedicated to S. L. Sobolev on his 80th birthday.
Novosibirsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 29, No. 5, pp. 109–111, September–October, 1988.
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Ershov, Y.L. Invariant generation. Sib Math J 29, 775–777 (1988). https://doi.org/10.1007/BF00970272
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DOI: https://doi.org/10.1007/BF00970272