Corpus nummorum saeculorum 9-11 qui in Suecia reperti sunt [8,1] : Catalogue of coins from the 9th-11th Centuries found in Sweden. Verzeichnis der in Schweden gefundenen Münzen des 9.-11. Jahrhunderts. 8. Östergötland. 1. Älvestad- Viby. - Malmer, Brita (Almqvist+Wiksell, 1983)