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Kiev Branch of the Institute "All-Union Order of the October Revolution State Project-Prospecting and Scientific-Research Institute for Energy Systems and Electric Networks. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 16, No. 2, pp. 74–75, April–June, 1982.
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Kochubei, A.N. Elliptic operators with boundary conditions on a subset of measure zero. Funct Anal Its Appl 16, 137–139 (1982). https://doi.org/10.1007/BF01081632
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DOI: https://doi.org/10.1007/BF01081632