Soikkanen was active in the study of Finland's history 1962–66 at Turku University, and 1967–76 in economic and social history.
In 1970 Virtanen was affiliated with Turku University, where he became professor 1990 in cultural history.
He was professor in Nordic history 1957–1962 at Turku University and professor in Finnish and Scandinavian history and church history at Helsinki University 1962–1978.
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