Abstract
Reseña de: Outi Merisalo - Päivi Pahta (eds.), Frontiers in the Middle Ages. Proceedings of the Third European Congress of the FIDEM (Jyväskylä, 10-14 June 2003), Brepols («Textes et Études du Moyen Age», 35), Louvain-La-Neuve 2006, XII+761 pp.