@article{MaSchaeferGreiner2006,
  author    = {Bo-Qiang Ma and Andreas Sch{\"a}fer and Walter Greiner},
  title     = {Flavor distributions in the nucleons: SU(2) sea asymmetry or isospin symmetry breaking?},
  journal   = {Physical review. D},
  volume    = {47},
  number    = {1},
  pages     = {51 -- 55},
  year      = {2006},
}