Literature Cited
A. V. Bitsadze, Boundary-value Problems for Second-Order Elliptic Equations [in Russian], Nauka, Moscow (1966).
R. Courant and D. Hilbert, Methods of Mathematical Physics, Vol. 2, Partial Differential Equations, John Wiley (1962).
Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 14, No. 5, pp. 1149–1152, September–October, 1973.
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Yanushauskas, A. One first-order system. Sib Math J 14, 804–806 (1973). https://doi.org/10.1007/BF00969919
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DOI: https://doi.org/10.1007/BF00969919