@unpublished{Seehafer2007,
  author  = {Norbert Seehafer},
  title   = {Nature of the α effect in magnetohydrodynamics},
  institution = {Institut f{\"u}r Physik und Astronomie},
  series    = {NLD Preprints},
  number    = {25},
  year    = {2007},
}