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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 12, No. 4, pp. 718–726, July–August, 1971.
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Klimov, V.S. Nonnegative solutions of boundary value problems for second-order elliptic equations. Sib Math J 12, 509–515 (1971). https://doi.org/10.1007/BF00967406
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DOI: https://doi.org/10.1007/BF00967406