Kaiser, Ulrich und Katrin Schmelting (2000), On the lead/lag-relationship between manufacturing and servics in the business cycle, ifo-studies 2/2000, 161-176.

Kaiser, Ulrich und Katrin Schmelting (1999), Do Business-related Services Really Lag Behind Manufacturing Industries in the Business Cycle?, ZEW Discussion Paper No. 99-34, Mannheim

ZEW-Wachstums- und Konjunkturanalysen Nr. 3 (September) - 1999