@article{vanmilligen:1994:evm,
    author = {{van Milligen}, B. {\relax{Ph}}. and {L{\'o}pez Fraguas}, A.},
     title = {Expansion of vacuum magnetic fields in toroidal
              harmonics},
   journal = {Comput. Phys. Comm.},
  fjournal = {Computer Physics Communications},
    volume = {81},
      year = {1994},
    number = {1-2},
     pages = {74–90},
 isinumber = {NV035},
       doi = {10.1016/0010-4655(94)90112-0}}