Inverse relations
[ .. ] → schema:contributor → Ypma, Gerard
IT in the European Union: driving productivity divergence? / Marcel P. Timmer, Gerard Ypma and Bart van der Arkschema:ProductModel
PPPs for industry output: a new dataset for international comparisons / by Marcel Timmer, Gerard Ypma, Bart van Arkschema:ProductModel
Productivity levels in distributive trades : a new ICOP dataset for OECD countries / Marcel Timmer, Gerard Ypmaschema:ProductModel
Unit labour costs, productivity and international competitiveness / Bart van Ark, Edwin Stuivenwold and Gerard Ypmaschema:ProductModel