6Broadus RN. Aproposed method for eliminating rifles from periodical subscription lists[J]. College & Research Libraries, 1985,46(1) :30- 35.
7Stein LL. What to keep and what to cut? Using Intemet as an objective tool to identify' core' periodical titles in a specialized subject collection [J] .Technical Services Quarterly, 1992, 10(1) :3 - 14.
8Milen D, Tiffany B. A cost- per- use method for evaluating the cost- effectiveness of serials: a detailed discussion of methodology[J] .Serials Review, 1991,17(2) :7 - 19.