@article{6964,
  author = {B. Van Zyl and Gordon Dunn and G. Chamberlain and D. Heddle},
  title = {Benchmark cross sections for electron-impact excitation of n 1S levels of He},
  year = {1980},
  journal = {Physical Review A},
  volume = {22},
  pages = {1916-1929},
  month = {Jan-11-1980},
  issn = {0556-2791},
  doi = {10.1103/PhysRevA.22.1916},
}