Chikashi Nobata Philip Cotter Naoaki Okazaki Brian Rea Yutaka Sasaki Yoshimasa Tsuruoka Jun-ichi Tsujii Sophia Ananiadou Kleio: a knowledge-enriched information retrieval system for biology. 787-788 2008 SIGIR http://doi.acm.org/10.1145/1390334.1390504 conf/sigir/2008 db/conf/sigir/sigir2008.html#NobataCORSTTA08