Kachur IS, Kurnosov VS, Piryatinskaya VG. Inversion of exchange interaction sign of Nd³⁺ excited states and its manifestation in optical absorption spectra of NdFe₃(BO₃)₄ crystal. Fiz. Nyzk. Temp. [інтернет]. 26, Березень 2024 [цит. за 10, Листопад 2025];50(5):465–468. доступний у: http://80.92.230.95/index.php/fnt/article/view/9238