00492naa#a2200157#i#450# EN\\bibl\131744 20260804114822.2 3034-4689 20260702b2026####ek#y0engy0150####ca RU METALLIC HYDROGEN: 90 YEARS OF UNSUCCESSFUL ATTEMPTS TO OBTAIN IT Journal article Kazan Kazan National Research Technological University 2026 4 с. Journal article local Mickailov Oleg Vasil'evich vestniktu.ru