1. T. N. Fomenko, “Cascade search for preimages and coincidences: Global and local versions,” Math. Notes 93 (1), 172–186 (2013). https://doi.org/10.1134/S0001434613010173
2. T. N. Fomenko and Yu. N. Zakharyan, “Zero preservation for a family of multivalued functionals, and applications to the theory of fixed points and coincidences,” Dokl. Math. 102 (1), 272–275 (2020). https://doi.org/10.1134/S1064562420040225
3. Cauchy problem for a system of ordinary differential equations;A. I. Perov,1964
4. A. I. Perov, “Generalized contraction mapping principle,” Vestn. Voronezh. Gos. Univ. Ser. Fiz. Mat., No. 1, 196–207 (2005).
5. E. S. Zhukovskiy, “On coincidence points of multivalued vector mappings of metric spaces,” Math. Notes 100 (3), 363–379 (2016). https://doi.org/10.1134/S0001434616090030