@Article{npg-10-313-2003,
AUTHOR = {Wiegelmann, T. and Neukirch, T.},
TITLE = {Computing nonlinear force free coronal magnetic fields},
JOURNAL = {Nonlinear Processes  in Geophysics},
VOLUME = {10},
YEAR = {2003},
NUMBER = {4/5},
PAGES = {313--322},
URL = {http://www.nonlin-processes-geophys.net/10/313/2003/},
DOI = {10.5194/npg-10-313-2003}
}