Xuebiao Xu Andrew C. Jones W. A. Gray N. J. Fiddian Richard J. White Frank A. Bisby Design and performance evaluation of a web-based multi-tier federated system for a catalogue of life. 104-107 2002 conf/widm/2002 WIDM http://doi.acm.org/10.1145/584931.584954 db/conf/widm/widm2002.html#XuJGFWB02