@article{ValoriGreenDemoulinetal.2012,
  author    = {Gherardo Valori and Lucie M. Green and Pascal Demoulin and S. Vargas Dominguez and L. van Driel-Gesztelyi and A. Wallace and Daniel N. Baker and Marcel Fuhrmann},
  title     = {Nonlinear force-free extrapolation of emerging flux with a global twist and serpentine fine structures},
  journal   = {Solar physics : a journal for solar and solar-stellar research and the study of solar terrestrial physics},
  volume    = {278},
  number    = {1},
  pages     = {73 -- 97},
  doi       = {10.1007/s11207-011-9865-8},
  year      = {2012},
}