Juha Honkala. Three Variants of the DT0L Sequence Equivalence Problem. J. UCS, 7(10):886-892, 2001. [doi]
@article{Honkala01:0,
  title = {Three Variants of the DT0L Sequence Equivalence Problem},
  author = {Juha Honkala},
  year = {2001},
  url = {http://www.jucs.org/jucs_7_10/three_variants_of_the},
  researchr = {https://researchr.org/publication/Honkala01%3A0},
  cites = {0},
  citedby = {0},
  journal = {J. UCS},
  volume = {7},
  number = {10},
  pages = {886-892},
}