S. S. Sosin, A. F. Iafarova, I. V. Romanova, O. V. Morozov, R. G. Batulin, M. Zhitomirsky, V. N. Glazkov, “Microscopic spin Hamiltonian for a dipolar Heisenberg magnet LiGdF$_4$ from EPR measurements”, Pis'ma v Zh. Èksper. Teoret. Fiz., 116:11 (2022), 747–755; JETP Letters, 116:11 (2022), 771–778
