@unpublished{SpielesJahnsSorgeetal.2006,
  author  = {Christian Spieles and Andr{\´e} Jahns and Horst Sorge and Horst St{\"o}cker and Walter Greiner},
  title   = {Subthreshold antiproton production in heavy ion collisions},
  institution = {Physik},
  pages     = {10},
  year    = {2006},
}