Numismatic literature, Sweden. "SVENSKA MYNT UNDER VIKINGATID OCH MEDELTID SAMT GOTLÄNDSKA MYNT" by Lars O. Lagerqvist, Stockholm 1970 + "AVESTA MYNTMUSEUM" by Bertil Tingström, Uppsala 1995 + "VIKING-AGE HOARDS AND LATE ANGLO-SAXON COINS" by Kenneth Jonsson, Stockholm 1987 + AURUM AUKTIONER AB, Auktion 1 (two ex), 2 (three ex), 3, 5 (two ex) and 6 + "LITT OM ANTIKKENS MYNTER" by Per Lundgren, Drammen 1967 + "NORDISK KULTUR MYNT", Stockholm 1936.