Institutional Isomorphism and Public Sector Organizations. Peter Frumkin and Joseph Galaskiewicz. Journal of Public Administration Research and Theory: J-PART. Vol. 14, No. 3 (Jul., 2004), pp. 283-307 ...

Refining with colors. Mathematicians have developed various strategies to compare graphs. Since the 1970s, algorithms have been able to test graph isomorphism, but in exponential time.