Perestyuk , M. O., and V. Yu. Slyusarchuk. “Application of the Green–Samoilenko Function and Operator to the Study of Non-Lipschitz Differential Equations”.
Ukrains’kyi Matematychnyi Zhurnal, vol. 73, no. 12, Dec. 2021, pp. 1673-90,
https://doi.org/10.37863/umzh.v73i12.6482.