Комментарии:EAS 112, KW 415, Владимирцов 361, Poppe 112, Дыбо 6, Мудрак Дисс. 39, Лексика 286, Doerfer MT 69-70. Despite АПиПЯЯ 282, Mongolian and Tungus forms should be still considered as genetically related to PT *dɨ̄ŕ (*dīŕ), and the reconstruction must be changed accordingly. This is one of the few cases of secondary voicing in PT (before *ŕ, *r): the original voiceless reflex is preserved within the Common Turkic derivative *tir-sgek 'elbow' (Лексика 247-248) ( = TM *türē-kse; the latter form, despite Rozycki 213, cannot be borrowed < Mong.).