Erik Aerts & Barry Eichengreen, eds. . Growth and stagnation in the Mediterranean world in the 19th and 20th centuries / Erik Aerts & Nuno Valério, eds. . Models of regional economies in antiquity and the Middle Ages to the 11th century / Erik Aerts, Jean Andreau & Peter Ørsted, eds. . Methodological problems / Erik Aerts, Thomas Kuczynski & Vladimir Vinogradov, eds. . Historical information systems / Rainer Metz, Eddy Van Cauwenberghe & Roel van der Voort, eds ; : B-9 - : B-12b. -- Leuven University Press, 1990. -- (Studies in social and economic history ; v. 12-16 . Proceedings : Tenth International Economic History Congress, Leuven, August 1990 / Erik Aerts, general editor ; session B, 9-12b).