▁Russia ▁in ▁the ▁ 1 9 2 0 s , ▁with ▁tens ▁of ▁thousands ▁of ▁other ▁White ▁Russian ▁imm igr ants . ▁From ▁ 1 9 2 0 ▁to ▁ 1 9 3 6 ▁he ▁was ▁a ▁professor ▁at ▁Bel grade ▁university , ▁where ▁he ▁received ▁his ▁doctor ate ▁in ▁ 1 9 2 8 ▁for ▁his ▁th esis ▁on ▁the ▁ 1 4 th - century ▁king ▁and ▁legisl ator ▁Stefan ▁U ro š ▁IV ▁Du š an ▁of ▁Ser bia . ▁ ▁After ▁the ▁second ▁World ▁War ▁he ▁was ▁de an ▁of ▁the ▁law ▁fac ulty ▁at ▁Sar aje vo ▁university ▁from ▁ 1 9 4 8 ▁to ▁ 1 9 4 9 ; ▁but ▁after ▁the ▁commun ist ▁take over ▁in ▁ ▁Y ug oslav ia ▁he ▁and ▁his ▁wife ▁were ▁arrested ▁and ▁ex iled ▁from ▁the ▁country ▁in ▁ 1 9 4 9 . ▁ ▁Sol ovie v ▁then ▁became ▁professor ▁of ▁S lav ic ▁studies ▁at ▁the ▁University ▁of ▁Gene va ▁( 1 9 5 1 – 1 9 6 1 ). ▁Sub sequently , ▁he ▁continued ▁his ▁career ▁in ▁Washington , ▁D . C . ▁ ▁He ▁died ▁on ▁ 1 5 ▁January ▁ 1 9 7 1 ▁in ▁Gene va . ▁ ▁For ▁a ▁short ▁time , ▁he ▁also ▁lect ured ▁at ▁the ▁University ▁of ▁L v ov , ▁where ▁he ▁published ▁his ▁research ▁on ▁Du š an ' s ▁Code ▁in ▁Polish . ▁ ▁His ▁son ▁Alexander ▁worked ▁at ▁the ▁Library ▁of ▁Congress ▁in ▁Washington