5Pieter van Brakel. Information portals, a strategy for importing external content[J]. The electronic library,2003, (6) :591 - 600.
6Maria Monopoll, David nicholas. A user-centred approach to the evaluation of Subject Based Information Gateways: case study SOSIG[J] .Aslib proceeds,2000,52:218.
7Rachel Heery. Information gateways: collaboration on content[J] .Online information review,2000, (1):40 - 45.
8Fohan van Halm. Information gateways[J]. New library worlds,2002, (11) :222- 224.
