@article{TVIM_2024_2_a4, author = {S. M. Tashpulatov}, title = {Structure of essential spectra and discrete spectrum of the energy operator of two-magnon systems with four-spin exchange {Hamiltonian}}, journal = {Taurida Journal of Computer Science Theory and Mathematics}, pages = {75--85}, publisher = {mathdoc}, number = {2}, year = {2024}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TVIM_2024_2_a4/} }