Alan F. Smeaton C. J. van Rijsbergen Experiment on Incorporation Syntactic Processing of User Queries into a Document Retrieval Strategy. 31-51 1988 SIGIR db/conf/sigir/sigir88.html#SmeatonR88 conf/sigir/88 SIGIR1988/P031.pdf db/conf/sigir/SmeatonR88.html