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Additional information
Novosibirsk Institute of Electrical Engineering. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 21, No. 2, pp. 155–159, March–April, 1980.
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Pinus, A.G. Weak commutativity of scattered summation of linear orders. Sib Math J 21, 262–265 (1980). https://doi.org/10.1007/BF00968273
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DOI: https://doi.org/10.1007/BF00968273