@article{Barmpalias2013GapBetweenTrivial,
  author  = {G. B. Barmpalias and M. Baartse},
  journal = {Theory Comput. Syst.},
  pages   = {28--47},
  title   = {On the gap between trivial and nontrivial initial segment prefix-free complexity},
  volume  = {52},
  year    = {2013},
}