@misc{indiciaea610566d4b77,
  title = {Decision procedure for indefinite hypergeometric summation.},
  author = {R W Gosper},
  year = {1978},
  doi = {10.1073/pnas.75.1.40},
  url = {https://pubmed.ncbi.nlm.nih.gov/16592483/},
  note = {Source identifier: 16592483}
}