TY - JOUR A1 - Büttner, Thomas A1 - Jacobebbinghaus, Peter A1 - Ludsteck, Johannes TI - Occupational Upgrading and the Business Cycle in West Germany PY - 2009/07/15 JA - Economics: The Open-Access, Open Assessment E-Journal VL - 3 IS - 2009-34 UR - http://www.economics-ejournal.org/economics/discussionpapers/2009-34 ER -