Previously on Euro Crime, the Scandinavia books page comprised authors, and their bibliographies, from Denmark, Finland, Norway and Sweden. After a bit of re-jigging, it now also includes authors from Iceland. Plus there are now separate pages for authors from Denmark, Finland, Norway and Sweden as well as the existing Iceland page.
The Euro Crime definition of Scandinavia, as being the five countries mentioned above, is one several definitions of Scandinavia, but it is in common usage (including the Official Website of the Scandinavian Tourist Boards in North America). The alternative definitions of Scandinavia and their relationship to the term, the Nordic countries, are explained on this About.com page.