@misc{indiciaefadbf4871efa,
  title = {Nonunique solution to the Schwinger-Dyson equations.},
  author = {CM Bender and F Cooper and LM Simmons},
  year = {1989},
  doi = {10.1103/physrevd.39.2343},
  url = {https://pubmed.ncbi.nlm.nih.gov/9959916/},
  note = {Source identifier: 9959916}
}