Magnon dressing by orbital excitations in ferromagnetic planes of $K_2CuF_4$ and $LaMnO_3$ / Snamina Mateusz , Oleś Andrzej // New Journal of Physics. - 2019 vol. 21 no. 2. - eISSN 1367-2630. - https://iopscience.iop.org/article/10.1088/1367-2630/aaf0d5/pdf