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- I. G. Tsar’kov, “Properties of Chebyshev Generalized Rational Fractions in $L_1$”, Russ. J. Math. Phys., 29, № 4, 2022, 583

- Alexey R. Alimov, “Solarity of sets in max-approximation problems”, J. Fixed Point Theory Appl., 21, № 3, 2019, 76

- Igor' Germanovich Tsar'kov, “Гладкие решения уравнения эйконала и поведение локальных минимумов функции расстояния”, Известия Российской академии наук. Серия математическая, 83, № 6, 2019, 167

- I. G. Tsar’kov, “Chebyshev Sets with Piecewise Continuous Metric Projection”, Math Notes, 113, № 5-6, 2023, 840

- I. G. Tsar’kov, “Smoothness of Solutions of the Eikonal Equation and Regular Points of Their Level Surfaces”, Russ. J. Math. Phys., 30, № 2, 2023, 259

- I. G. Tsar’kov, “The Geometry of a Singular Set of Hypersurfaces and the Eikonal Equation”, Math Notes, 108, № 3-4, 2020, 426

- A. R. Alimov, “Singularities of Solutions of the Eikonal Equation”, Diff Equat, 55, № 10, 2019, 1311

- Igor' Germanovich Tsar'kov, “$\theta$-metric function
in the problem of minimization of functionals”, Izv. Math., 88, № 2, 2024, 369

- I. G. Tsar’kov, “Smooth solutions of the eikonal equation and the behaviour of local minima of the distance function”, Izv. Math., 83, № 6, 2019, 1234
