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Additional information
Translated from Kibernetika, No. 6, pp. 13–17, November–December, 1984.
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Andon, F.I., Reznichenko, V.A. & Yashunin, A.E. A calculus for hierarchical data structures. Cybern Syst Anal 20, 785–790 (1984). https://doi.org/10.1007/BF01072163
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DOI: https://doi.org/10.1007/BF01072163