@article{SeehaferFuhrmannValorietal.2007, author = {Norbert Seehafer and M. Fuhrmann and Gherardo Valori and Bernhard Kliem}, title = {Force-free magnetic fields in the solar atmosphere}, url = {http://www3.interscience.wiley.com/cgi-bin/abstract/117872628/ABSTRACT}, year = {2007}, }