Cite this article:

Liu Jinsnan. . New Technology of Library and Information Service, 2002, 18(4): 5-6.

URL:

https://manu44.magtech.com.cn/Jwk_infotech_wk3/EN/10.11925/infotech.1003-3513.2002.04.03     OR     https://manu44.magtech.com.cn/Jwk_infotech_wk3/EN/Y2002/V18/I4/5