S. M. Chuiko, “On the Regularization of a Linear Fredholm Boundary-Value Problem by a Degenerate Pulsed Action”, J Math Sci, 197, № 1, 2014, 138
V. I. Bilenko, K. V. Bozhonok, S. Yu. Dzyadyk, “Piecewise-Polynomial Approximations for the Solutions of Impulsive Differential Equations”, Ukr Math J, 71, № 2, 2019, 190
Peter Benner, Sergiy Chuiko, Olga Nesmelova, “Autonomous periodic boundary-value problems with switchings at nonfixed points of time”, Nelin. Kolyv., 27, № 4, 2024, 469