Addison, John T. (contributor); Schnabel, Claus (contributor) - 2006
is characterized by modest growth and stagnation
up to the end of the 1980s, with membership in the four main union …. Other sources point to stagnation in the 1990s and to further
decline since 2000 (Kohaut and Ellguth, 2005, Table 5). In …: Convergence or Divergence?” Applied Economics Quarterly 49 (3): 213-232.
Schnabel, Claus and Joachim Wagner. 2005. Determinants …