@misc{indiciae24a234332684,
  title = {On the classical trapping problem.},
  author = {C P Calderón and T A Kwembe},
  year = {1990},
  doi = {10.1016/0025-5564(90)90061-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/2134492/},
  note = {Source identifier: 2134492}
}