@inproceedings{ManMerMit12,
  author    = {Florin Manea and Robert Merca\c{s} and Victor Mitrana},
  title     = {Hairpin Lengthening and Shortening of Regular Languages},
  booktitle = {Languages Alive (Essays Dedicated to {J}\"{u}rgen {D}assow on the Occasion
of His 65th Birthday)},
  pages     = {145--159},
  publisher = {Springer},
  series    = {Lecture Notes in Computer Science},
  editors   = {H. Bordihn and M. Kutrib and B. Truthe},
  ee = {http://dx.doi.org/10.1007/978-3-642-31644-9_10},
  volume    = {7300},
  year      = {2012},
}