@article{Chisala1994,
  author    = {{Busiso P. Chisala}},
  title     = {{Cycles in Collatz Sequences}},
  journal   = {{Publ. Math. Debrecen}},
  year      = {{1994}},
  volume    = {{45}},
  pages     = {{35--39}},
  note      = {{MR 95h:11019}},
}