Geodesic
Defect Numbers of the Dirichlet Problem for a Properly Elliptic Sixth-Order Equation
Matematičeskie zametki, Tome 104 (2018) no. 3, pp. 345-355

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The Dirichlet problem for a class of properly elliptic sixth-order equations in the unit disk is considered. Formulas for determining the defect numbers of this problem are obtained. Linearly independent solutions of the homogeneous problem and conditions for the solvability of the inhomogeneous problem are given explicitly.
Keywords: properly elliptic equations, boundary value problems, Dirichlet problem, defect numbers. 
@article{MZM_2018_104_3_a2,
     author = {A. O. Babayan and S. O. Abelyan},
     title = {Defect {Numbers} of the {Dirichlet} {Problem} for a {Properly} {Elliptic} {Sixth-Order} {Equation}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {345--355},
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     number = {3},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2018_104_3_a2/}
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A. O. Babayan; S. O. Abelyan. Defect Numbers of the Dirichlet Problem for a Properly Elliptic Sixth-Order Equation. Matematičeskie zametki, Tome 104 (2018) no. 3, pp. 345-355. http://geodesic.mathdoc.fr/item/MZM_2018_104_3_a2/