Otelbaev M 1

1. Solution estimates for one class of elliptic and parabolic nonlinear equations
2. Integral Representations of Vector Functions Based on the Parametrix of First-Order Elliptic Systems
3. Issues in the Expansion and Contraction of Operators
4. On the theory of generalized analytic Vekua functions with a singular point
5. Modeling Gas Compressor Station Operation to Minimize Fuel Costs for Surge Zone Protection
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