1. Graph isomorphism is in SPP;Arvind,2002
2. The isomorphism problem for directed path graphs and for rooted directed path graphs;Babel;J. Algorithms,1996
3. K.S. Booth, C.J. Colbourn, Problems polynomially equivalent to graph isomorphism, Technical Report CS-77-04, Computer Science Department, University of Waterloo, 1979.
4. Graph classes;Brandstädt,1999
5. Graph isomorphism and identification matrices;Chen;J. Comput. Syst. Sci.,1999