@article{JMLR:v18:14-317,
  author  = {An C. Tran and Jens Dietrich and Hans W. Guesgen and Stephen Marsland},
  title   = {Parallel Symmetric Class Expression Learning},
  journal = {Journal of Machine Learning Research},
  year    = {2017},
  volume  = {18},
  number  = {64},
  pages   = {1--34},
  url     = {http://jmlr.org/papers/v18/14-317.html}
}