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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 9, No. 3, pp. 554–567, May–June, 1968.
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Kruglyakov, I.Z. 2-families of lines in P3 and pairs of congruent lines in P3 . Sib Math J 9, 417–426 (1968). https://doi.org/10.1007/BF01040904
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DOI: https://doi.org/10.1007/BF01040904