Peter G. Anick Jeffrey D. Brennan Rex A. Flynn David R. Hanssen Bryan Alvey Jeffrey M. Robbins A Direct Manipulation Interface for Boolean Information Retrieval via Natural Language Query. 135-150 1990 SIGIR db/conf/sigir/sigir90.html#AnickBFHAR90 conf/sigir/90 SIGIR1990/P135.pdf db/conf/sigir/AnickBFHAR90.html