Pryimak, O. and Volodymyr, Y. 2022. Head-on collision of flocks. Bulletin of V.N. Karazin Kharkiv National University, series «Mathematical modeling. Information technology. Automated control systems». 56, (Dec. 2022), 51-65. DOI:https://doi.org/10.26565/2304-6201-2022-56-05.