@article{JMLR:v16:marusic15a,
  author  = {Ines Marusic and James Worrell},
  title   = {Complexity of Equivalence and Learning for Multiplicity Tree Automata},
  journal = {Journal of Machine Learning Research},
  year    = {2015},
  volume  = {16},
  number  = {76},
  pages   = {2465--2500},
  url     = {http://jmlr.org/papers/v16/marusic15a.html}
}