Jul 22 2013 Joachim Wagner and Yama Temouri   Do outliers and unobserved heterogeneity explain the exporter productivity premium? Evidence from France, Germany and the United Kingdom   Abstract  Contact Information  Citation  Full Text  -  Note   Feb 21 2013 Joachim Wagner   Are low-productive exporters marginal exporters? Evidence from Germany   Abstract  Contact Information  Citation  Full Text  -  Note