1. Abel W. (1966), Agrarkrisen und Agrarkonjunktur. Eine Geschichte der Land und Ernahrungswirtschaft Mitteleuropas seit dem hohen Mittelalter, Verlag Paul Parey, Hamburg und Berlin. Italian translation 1976 Einaudi Torino.
2. Technological progress and regress in pre-industrial times;Aiyar;Journal of Economic Growth,2008
3. The great divergence in European wages and prices from the Middle Ages to the First World War;Allen;Explorations in Economic History,2001
4. A review of Gregory Clark's a farewell to alms: a brief economic history of the world;Allen;Journal of Economic Literature,2008
5. Ashraf Q. and O. Galor (2008), Dynamic and stagnation in the Malthusian epoch: Theory and evidence, mimeo.