TY JOUR TI Classification of risks of budgetary institutions in the field of procurement KW public procurement KW budgetary institutions KW risk classification KW competitive procurement KW non-competitive procurement KW procurement stages KW risk source JO Vestnik of Astrakhan State Technical University. Series: Economics AU Bastrykin, S.. AU Azhmullayeva, N.. PY 2026 IS 2026 PB Astrakhan State Technical University