TY CONF TI SOLUTION OF THE «GERMAN QUESTION» AT THE CONGRESS OF VIENNA: HISTORICAL AND LEGAL ASPECT KW Congress of Vienna KW act of Union KW German Union KW Austro-Prussian dualism KW South German States JO Law and law: problems of theory and practice AU Shagaev, V.A. AU Alyaeva, L.A. PY 2024 PB Publishing Center RIOR