by M. Dehmer, F. Emmert-Streib
Reference:
Structural Similarity of Directed Universal Hierarchical Graphs: A low Computational Complexity Approach (M. Dehmer, F. Emmert-Streib), In Applied Mathematics and Computation, volume 194, 2007.
Bibtex Entry:
@Article{em_j16,
  author = 	 {Dehmer, M. and Emmert-Streib, F.},
  title = 	 {Structural Similarity of Directed Universal Hierarchical Graphs: A low Computational Complexity Approach},
  journal = 	 {Applied Mathematics and Computation},
  year = 	 {2007},
  OPTkey = 	 {},
  volume = 	 {194},
  number = 	 {1},
  OPTpages = 	 {7-20},
  OPTmonth = 	 {},
  OPTnote = 	 {},
  OPTannote = 	 {},
  OPTweb   =     {http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TY8-4NJ0TCX-2&_user=10&_coverDate=04%2F19%2F2007&_alid=592298605&_rdoc=3&_fmt=summary&_orig=search&_cdi=5612&_sort=d&_docanchor=&view=c&_ct=10&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=21bece5f82a394be2861b955c308bcff},
  OPTCategory =  {BN, ML}
}