A.Sh.Shaldanbayev, M.I.Akylbayev, A.A.Shaldanbayeva, & A.Zh.Beisebayeva. (2019). ON THE SPECTRAL PROPERTIES OF A WAVE OPERATOR PERTURBED BY A LOWER-ORDER TERM. Известия НАН РК. Серия физико-математическая, (4), 22–29. извлечено от https://journals.nauka-nanrk.kz/physics-mathematics/article/view/1672