Cite this article:

Zhou Ning. . New Technology of Library and Information Service, 2002, 18(4): 4-4.

URL:

https://manu44.magtech.com.cn/Jwk_infotech_wk3/EN/10.11925/infotech.1003-3513.2002.04.02     OR     https://manu44.magtech.com.cn/Jwk_infotech_wk3/EN/Y2002/V18/I4/4