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@inproceedings{göran1946eine,
  title={Eine Umkehrung der Sturm-Liouvilleschen Eigenwertaufgabe},
  author={Göran Borg},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203121384631658},
  booktitle={Acta Mathematica},
  volume={78},
  number={1},
  pages={1-96},
  year={1946},
}