@article{LaackRefischOhnsorgeetal.1984,
  author    = {Laack, Walter van and Refisch, A. and Ohnsorge, J. and D{\"u}rselen, L.},
  title     = {Proximaler Femurteilersatz - Alternative zum Schaftwechsel zementfixierter H{\"u}ftendoprothesen},
  series = {Orthop{\"a}dische Praxis. 20 (1984), H. 11},
  journal   = {Orthop{\"a}dische Praxis. 20 (1984), H. 11},
  isbn      = {0030-588x},
  pages     = {856},
  year      = {1984},
  language  = {de}
}
@article{LaackDuerselen1985,
  author    = {Laack, Walter van and D{\"u}rselen, L.},
  title     = {Neues Konzept zur zementlosen Prothesenverankerung},
  series = {Orthop{\"a}dische Praxis. 21 (1985), H. 11},
  journal   = {Orthop{\"a}dische Praxis. 21 (1985), H. 11},
  isbn      = {0030-588x},
  pages     = {874},
  year      = {1985},
  language  = {de}
}
@article{LaackDuerselen1985,
  author    = {Laack, Walter van and D{\"u}rselen, L.},
  title     = {Alternative zur dauerhaften Verankerung von Gelenkendoprothesen},
  series = {Zeitschrift f{\"u}r Orthop{\"a}die und ihre Grenzgebiete. 123 (1985), H. 4},
  journal   = {Zeitschrift f{\"u}r Orthop{\"a}die und ihre Grenzgebiete. 123 (1985), H. 4},
  isbn      = {0044-3220},
  pages     = {653},
  year      = {1985},
  language  = {de}
}