@article{11351,
  author = {H.-J. Beyer and H. Kleinpoppen},
  title = {Measurement of the Lamb shift 42S1/2-42P1/2 of the helium ion},
  year = {1967},
  journal = {Zeitschrift für Physik},
  volume = {206},
  pages = {177-183},
  month = {Jan-04-1967},
  issn = {1434-6001},
  doi = {10.1007/BF01325925},
}