For those here who take an interest in the Scandinavian sweep among crime novels, Sarah Weinman has a link in today's "Smatterings" to an interview with Maj Wahloo (who knew she was still alive!) where she explains the origin of the Martin Beck novels and their relationship with, say Mankell's or McBain's.
The Sjowall-Wahloo novels are superb and clearly responsible for subsequent excellent police procedurals not only in Scandinavian countries, but also in Great Britain..