Yves Chiaramella Jian-Yun Nie A Retrieval Model Based on an Extended Modal Logic and its Application to the RIME Experimental Approach. 25-43 1990 SIGIR db/conf/sigir/sigir90.html#ChiaramellaN90 conf/sigir/90 SIGIR1990/P025.pdf db/conf/sigir/ChiaramellaN90.html