@article{Belaga2003,
  author    = {{Edward Belaga}},
  title     = {{Effective polynomial upper bounds to perigees and numbers of $(3x+d)$-cycles of a given oddlength}},
  journal   = {{Acta Arithmetica}},
  year      = {{2003}},
  volume    = {{106}},
  number    = {{2}},
  pages     = {{197--206}},
  note      = {{MR 2003m:11120}},
}