@article{Lanczos1950,
  author  = {Lanczos, C.},
  title   = {{An iteration method for the solution of the eigenvalue problem of linear differential and integral operators}},
  journal = {Journal of Research of the National Bureau of Standards},
  volume  = {45},
  number  = {4},
  pages   = {255--282},
  year    = {1950},
  doi     = {10.6028/jres.045.026}
}