@article{Klamkin1963,
  author    = {{Murray S. Klamkin}},
  title     = {{Problem $63-13^{*}$}},
  journal   = {{SIAM Review}},
  year      = {{1963}},
  volume    = {{5}},
  pages     = {{275--276}},
  doi       = {{10.1137/1005074}},
  url       = {{https://epubs.siam.org/doi/10.1137/1007049}},
}