00577naa#a2200169#i#450# EN\URAL'SKIY GOSUDARSTVENNYY AGRARNYY UNIVERSITET\bibl\42064 20240502203441.4 1997-4868 20210129b2021####ek#y0engy0150####ca RU Factors of changing demand for the food market of Saint Petersburg Journal article Ekaterinburg Ural State Agrarian University 2021 8 с. Journal article local Nikonova Galina Nikolaevna Nikonov Aleksey Grigor'evich usau.editorum.ru