Combination Retrieval for Creating Knowledge from Sparse Document Collection.

Naohiro Matsumura Yukio Ohsawa Combination Retrieval for Creating Knowledge from Sparse Document Collection. 320-324 http://dx.doi.org/10.1007/3-540-44418-1_39 2000 conf/dis/2000 Discovery Science db/conf/dis/dis2000.html#MatsumuraO00