Cite this article:

. . New Technology of Library and Information Service, 1997, 13(6): 3-4.

URL:

https://manu44.magtech.com.cn/Jwk_infotech_wk3/EN/10.11925/infotech.1003-3513.1997.06.01     OR     https://manu44.magtech.com.cn/Jwk_infotech_wk3/EN/Y1997/V13/I6/3