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Additional information
Physicotechnical Institute of Lower Temperatures, Kharkov. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 23, No. 1, pp. 130–135, January–February, 1982.
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Novitskii, M.V. A certain class of positive eigenfunctions of a second-order elliptic operator. Sib Math J 23, 101–105 (1982). https://doi.org/10.1007/BF00971425
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DOI: https://doi.org/10.1007/BF00971425