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Additional information
Higher Institute of Preservation and Flavoring Industry, Plovdiv, Bulgaria. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 21, No. 6, pp. 156–160, November–December, 1980.
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Dimitrov, Z.I. Rigidly directed groups. Sib Math J 21, 868–871 (1980). https://doi.org/10.1007/BF00968476
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DOI: https://doi.org/10.1007/BF00968476