Official minority languages of Sweden
Finnish has been spoken in Sweden ever since the (then provincial) borders were drawn in the 13th century. Sweden has always had a significant migration to and from Finland. As the two languages belong to different language families it is easy to distinguish them, unlike the neighbouring languages Norwegian and Danish. The number of Finnish speakers in Sweden today has been estimated to over 460,000. Even though many current Swedes are of full or mixed Finnish descent, Swedish is the main language in practice for many bilinguals.
Swedish literature
The Swedish language is an official language in Finland, with approximately 5.6% of the population having it as their mother tongue. Hence Swedish language literature has a considerable following in Finland, with several well-known Swedish-speaking Finnish writers, such as Bo Carpelan, Christer Kihlman and Tove Jansson. Jansson, perhaps best known for her Moomin books for children, wrote novels and short stories for adults, including "Sommarboken", (1972, "The Summer Book").