books.google.com - Why did gay marriage originate in Scandinavia? What happened next? What are the benefits and the dangers of assimilation?"...https://books.google.com/books/about/Odd_Couples.html?id=_zhrdSW1PMwC&utm_source=gb-gplus-shareOdd Couples
Jens Rydström is Associate Professor of Gender Studies at Lund University, Sweden. He is also the author of Sinners and citizens: Bestiality and homosexuality in Sweden 1880-1950. University of Chicago Press (2003).
Odd Couples: A History of Gay Marriage in Scandinavia