Geodesic
Solutions of Fixed Sign of Higher-Order Inhomogeneous Equations of Mixed Elliptic-Hyperbolic Type
Matematičeskie zametki, Tome 100 (2016) no. 3, pp. 433-440

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For a higher-order inhomogeneous equation of mixed elliptic-hyperbolic type, the property of the solution to be of fixed sign is established, depending on the sign of the right-hand side.
Keywords: inhomogeneous equation of mixed type, Lavrentev–Bitsadze operator, high-order equation, polyharmonic equation. 
@article{MZM_2016_100_3_a9,
     author = {K. B. Sabitov},
     title = {Solutions of {Fixed} {Sign} of {Higher-Order} {Inhomogeneous} {Equations} of {Mixed} {Elliptic-Hyperbolic} {Type}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {433--440},
     publisher = {mathdoc},
     volume = {100},
     number = {3},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2016_100_3_a9/}
}
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K. B. Sabitov. Solutions of Fixed Sign of Higher-Order Inhomogeneous Equations of Mixed Elliptic-Hyperbolic Type. Matematičeskie zametki, Tome 100 (2016) no. 3, pp. 433-440. http://geodesic.mathdoc.fr/item/MZM_2016_100_3_a9/