Incorporating Different Search Models into One Document Retrieval System.

http://doi.acm.org/10.1145/511754.511760 W. Bruce Croft Incorporating Different Search Models into One Document Retrieval System. 40-45 SIGIR1981/P040.pdf 1981 conf/sigir/81 SIGIR db/conf/sigir/sigir81.html#Croft81