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Translated from Ukrainskii Matematicheskii Zhurnal, Vol.20, No.2, pp.253–257, March–April, 1968.
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Isaev, L.E. Theory of characteristic functions of operator nodes. Ukr Math J 20, 228–232 (1968). https://doi.org/10.1007/BF01085541
- Characteristic Function
- Operator Node