Yevstafyeva V.V. 2021. Existence of two-point oscillatory solutions of a relay nonautonomous system with a multiple eigenvalue of a real symmetric matrix. Ukrains’kyi Matematychnyi Zhurnal. 73, 5 (May 2021), 640 - 650. DOI:https://doi.org/10.37863/umzh.v73i5.6379.