@article{Sowada1998,
  author    = {Sowada, Christoph},
  title     = {Socjalne Ubezpieczenie w Niemczech a sprawiedliwo÷{\~n} spoleczna},
  year      = {1998},
  language  = {pl}
}
@article{Groezinger1998,
  author    = {Gr{\"o}zinger, Elvira},
  title     = {Moja polska dekada},
  year      = {1998},
  language  = {pl}
}