Geodesic
A~mixed boundary value problem for a~hyperbolic equation with degenerate principal part
Sbornik. Mathematics, Tome 43 (1982) no. 4, pp. 499-513

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For a hyperbolic equation with degenerate principal part this paper considers a mixed problem with homogeneous boundary values and modified initial data. Sufficient conditions for its unique solvability are found. Bibliography: 8 titles. 
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     author = {F. T. Baranovskii},
     title = {A~mixed boundary value problem for a~hyperbolic equation with degenerate principal part},
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     volume = {43},
     number = {4},
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     url = {http://geodesic.mathdoc.fr/item/SM_1982_43_4_a3/}
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F. T. Baranovskii. A~mixed boundary value problem for a~hyperbolic equation with degenerate principal part. Sbornik. Mathematics, Tome 43 (1982) no. 4, pp. 499-513. http://geodesic.mathdoc.fr/item/SM_1982_43_4_a3/