00604naa#a2200169#i#450# EN\\bibl\125773 20260709220759.4 2782-4586 20260630b2026####ek#y0engy0150####ca RU Industry diversification in the domestic stock market when forming a private investor's portfolio Journal article Moscow ITBO University 2026 8 с. Journal article local Биржи ценных бумаг. Биржи активов. Фондовые биржи. 336.761 Borodavko Lyubov' Sergeevna zhpi.ru