The following article is available online in the first issue of Early Christianity.
Matthias Konradt, “Die Christonomie der Freiheit. Zu Paulus’ Entfaltung seines ethischen Ansatzes in Gal 5,13-6,10.” Early Christianity. 1:1 (2010): 60-81.
Obviously it is not in English but there is an English abstract and if you are interested you can cut and paste it into Google translator.