@unpublished{AmirbekyanMichel2007,
  author  = {Abel Amirbekyan and Volker Michel},
  title   = {Splines on the 3-dimensional Ball and their Application to Seismic Body Wave Tomography},
  institution = {Fachbereich Mathematik},
  series    = {Schriften zur Funktionalanalysis und Geomathematik},
  number    = {33},
  year    = {2007},
  url  = {http://nbn-resolving.de/urn:nbn:de:hbz:386-kluedo-14903},
}