00504naa#a2200169#i#450# EN\INFRA-M\bibl\9940 20260331192744.2 2587-9111 20151218b2015####ek#y0engy0150####ca RUS RU On the Results of Studying Kondratieff Waves in the Economy of Spain Journal article Moscow INFRA-M Academic Publishing LLC. 2015 5 с. Journal article local Levkina Nataliya Nikolaevna naukaru.ru