00667naa#a2200193#i#450# EN\\bibl\47889 20260206080048.5 2073-5537 20211221b2021####ek#y0engy0150####ca RU Qualified personnel migration runoff threatens regional economic security Journal article Astrakhan Astrakhan State Technical University 2021 10 с. Journal article local Экономика. Экономические науки. 33 Polyanskaya Elina Victorovna Karlina Elena Prokofievna Kolmakova Liliya Khalitovna vestnik.astu.org