Book review: The Sigtuna Coinage c. 995-1005. Commentationes de Nummis Saeculorum IX-XI in Suécia Repertis Nova Series 4 (Royal Academy of Letters, History, and Antiquities in collaboration with the Numismatic Institute in Stockholm University, the Central Board of National Antiquities, and the Royal Coin Cabinet (authored by: Brita Malmer)