00530naa#a2200181#i#450# EN\INFRA-M\bibl\6070 /en/manage/index 20250905032836.5 2587-9111 20150617b2015####ek#y0engy0150####ca RUS RU Kondratiev Waves in the Economy of Belgium Journal article Moscow INFRA-M Academic Publishing LLC. 2015 4 с. Journal article local Averina Tatyana Nikolaevna test.editorum.ru /en/manage/index