@article{Wiggin1988,
  author    = {{Blanton C. Wiggin}},
  title     = {{Wondrous Numbers -- Conjecture about the $3n  +  1$ family}},
  journal   = {{J. Recreational Math.}},
  year      = {{1988}},
  volume    = {{20}},
  pages     = {{52--56}},
}