@Article{ZhangGildea-jis07,
  author = {Hao Zhang and Daniel Gildea},
  title = {Enumeration of Factorizable Multi-Dimensional Permutations},
  journal = {Journal of Integer Sequences},
  year = {2007},
  volume = {07},
  number = {5.8},
  URL = {http://www.cs.rochester.edu/~gildea/pubs/zhang-gildea-jis07.pdf}
}
