[1]Hammer J., Garcia-Molina H., Cho J., Aranha R., and Crespo A., Extracting semistructured information from the web,SIGOD Record, 1997, 26(2):18-25[2]Huang Yu-qing
The famous "six letters" experiment carried out by Milgram demonstrated the existence of small-world effect in a complex network. One vertex tends to be connect