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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 19, No. 1, pp. 172–179, January–February, 1978.
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Solon, B.Y. E-powers of hyperimmune retraceable sets. Sib Math J 19, 122–127 (1978). https://doi.org/10.1007/BF00967372
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DOI: https://doi.org/10.1007/BF00967372