@article {FNP12,
   author = {Foucaud, Florent and Naserasr, Reza and Parreau, Aline},
   title = {Characterizing Extremal Digraphs for Identifying Codes and Extremal Cases of Bondy’s Theorem on Induced Subsets},
   journal = {Graphs and Combinatorics},
   publisher = {Springer Japan},
   issn = {0911-0119},
   keyword = {Mathematics and Statistics},
   pages = {1-11},
   url = {http://dx.doi.org/10.1007/s00373-012-1136-4},
   note = {10.1007/s00373-012-1136-4},
 volume ={29},
number={13},
pages={463--473},
year={2013},

}