Ю. М-А. Хэн, ямар сэдвээр, хаана, хэзээ. : Who, which theme, where, when. Mong.Sud [Internet]. 2023 May 3 [cited 2025 Dec. 8];31(328):227-35. Available from: https://journal.num.edu.mn/ms/article/view/4355