@article{FreemanSW11,
  title = {On the Tennis Ball Problem},
  author = {John M. Freeman and Tomas Schonbek and Wandi Wei},
  year = {2011},
  url = {http://math.colgate.edu/~integers/l41/l41.Abstract.html},
  researchr = {https://researchr.org/publication/FreemanSW11},
  cites = {0},
  citedby = {0},
  journal = {Integers},
  volume = {11},
}