A.-K. Luah Wee Keong Ng Ee-Peng Lim W.-P. Lee Yinyan Cao Locating Web Information Using Web Checkpoints. 716-720 1999 DEXA Workshop http://computer.org/conferen/proceed/dexa/0281/02810716abs.htm db/conf/dexaw/dexaw99.html#LuahNLLC99