@article{BergmannScheefer2014,
  author    = {Peter Bergmann and Hans-Joachim Scheefer},
  title     = {Three and four centre oscillators and their application in nuclear physics},
  journal   = {Zeitschrift f{\"u}r Naturforschung, A},
  volume    = {29},
  number    = {7},
  pages     = {1003 -- 1010},
  doi       = {10.1515/zna-1974-0703},
  year      = {2014},
}