@misc{indiciae977ba939ab39,
  title = {Convergence proof for optimized delta expansion: Anharmonic oscillator.},
  author = {A Duncan and HF Jones},
  year = {1993},
  doi = {10.1103/physrevd.47.2560},
  url = {https://pubmed.ncbi.nlm.nih.gov/10015851/},
  note = {Source identifier: 10015851}
}