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1. Estimates of Approximation Numbers and Completeness of Root Vectors of A Singular Operator Generated by the Linear Part of the Korteweg-de Vries Operator
2. Estimates of Approximation Numbers, Nuclearity of the Resolvent of a Third-Order Singular Differential Operator, and the Completeness of Its Root Vectors
3. Maximum Regularity of a Third-Order Singular Nonlinear Equation
4. Separability and Estimates for Eigenvalues and Singular Numbers of a Class of Hyperbolic-Type Differential Operators
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