00469naa#a2200169#i#450# EN\INFRA-M\bibl\6075 20241005041037.6 2587-9111 20150617b2015####ek#y0engy0150####ca RUS RU Kondratiev Waves in the US Economy Journal article Moscow INFRA-M Academic Publishing LLC. 2015 8 с. Journal article local Basovskiy Leonid Efimovich naukaru.ru