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Additional information
Novosibirsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 30, No. 3, pp. 16–23, May–June, 1989.
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Blokhin, A.M., Tkachev, D.L. A mixed problem for the wave equation in a domain with an angle (scalar case). Sib Math J 30, 358–364 (1989). https://doi.org/10.1007/BF00971489
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DOI: https://doi.org/10.1007/BF00971489