00474naa#a2200157#i#450# EN\\bibl\98542 20250905185554.5 3034-4689 20250801b2025####ek#y0engy0150####ca RU UNUSUAL VALENCE STATES OF IMPURITIES IN THE DIRAC SEMIMETAL Journal article Kazan Kazan National Research Technological University 2025 4 с. Journal article local Goryunov Yu. V. vestniktu.ru