@misc{indiciae0073853997d8,
  title = {Probability generating functions of absolute difference of two random variables.},
  author = {P S Puri},
  year = {1966},
  doi = {10.1073/pnas.56.4.1059},
  url = {https://pubmed.ncbi.nlm.nih.gov/16591374/},
  note = {Source identifier: 16591374}
}