@misc{indiciaed00094e3f70e,
  title = {Chimpanzee counting and rhesus monkey ordinality judgments},
  author = {Rumbaugh, Duane M. and Washburn, David A. and Hopkins, William D. and Savage-Rumbaugh, E. S.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19920065473},
  note = {Source identifier: 19920065473}
}