@misc{indiciaee9e90a752447,
  title = {Integration of operator differential equations.},
  author = {CM Bender and GV Dunne},
  year = {1989},
  doi = {10.1103/physrevd.40.3504},
  url = {https://pubmed.ncbi.nlm.nih.gov/10011720/},
  note = {Source identifier: 10011720}
}