BihunD. S., PokutnyiO. O., & PanasenkoE. V. (2021). Autonomous nonlinear boundary-value problems for the Lyapunov equation in Hilbert space. Ukrains’kyi Matematychnyi Zhurnal, 73(7), 867 - 878. https://doi.org/10.37863/umzh.v73i7.6691