@Inproceedings{EPTCS63.18,
  author    = {Fici, Gabriele},
  year      = {2011},
  title     = {A Classification of Trapezoidal Words},
  editor    = {Ambro\v{z}, Petr and Holub, \v{S}t\v{e}p\'an and Mas\'akov\'a, Zuzana},
  booktitle = {{\rm Proceedings 8th International Conference}
               Words 2011,
               {\rm Prague, Czech Republic, 12-16th September 2011}},
  series    = {Electronic Proceedings in Theoretical Computer Science},
  volume    = {63},
  publisher = {Open Publishing Association},
  pages     = {129-137},
  doi       = {10.4204/EPTCS.63.18},
}