@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}
}