@article{PetzoldGrauel2014,
  author    = {R. Petzold and Adolf Grauel},
  title     = {Ein Vergleich von Eigenkanal-und R-Matrix-Theorie},
  journal   = {Zeitschrift f{\"u}r Naturforschung, A},
  volume    = {27.1972},
  number    = {10},
  pages     = {1508 -- 1515},
  doi       = {10.1515/zna-1972-1021},
  year      = {2014},
}