Victor Orlov, “Moving Singular Points and the Van der Pol Equation, as Well as the Uniqueness of Its Solution”, Mathematics, 11:4 (2023), 873
Victor Orlov, Magomedyusuf Gasanov, “The Maximum Domain for an Analytical Approximate Solution to a Nonlinear Differential Equation in the Neighborhood of a Moving Singular Point”, Axioms, 12:9 (2023), 844
Victor Orlov, “Dependence of the Analytical Approximate Solution to the Van der Pol Equation on the Perturbation of a Moving Singular Point in the Complex Domain”, Axioms, 12:5 (2023), 465