Terahertz optical activity near crystal field transitions of Tm3+ ions in magnetoelectric alumoboratesRemoveA. M. Kuzmenko, V. Yu. Ivanov, S. V. Garnov, A. Shuvaev, A. Pimenov, K. N. Boldyrev, I. A. Gudim, and A. A. MukhinPhys. Rev. B 113, 024418 (2026)