Question: When did Nina Arkina's husband die?
Sentence (from "Nina Arkina"): She issued biographical novels about Catherine the Great (1949), Alexander I of Russia (two volumes in 1950 and 1951), Nicholas I of Russia and Alexander Pushkin (1954), Alexander II of Russia (1956), Alexander III of Russia and Nicholas II of Russia (1963), Sonya Kovalevsky (1967), Karl Marx (1968) and Vladimir Lenin (1972).
Relevant evidence: No