- SIGIR Forum 45(2):17-31 (2011)
- JASIST 63(1):86-97 (2012)
- SIGMOD Record 14(1):15-38 (1984)
- ACM Trans. Inf. Syst. 29(4):19 (2011)
- Computer Methods and Programs in Biomedicine 104(3):349-357 (2011)
- Information & Software Technology 42(11):777-792 (2000)
- Encyclopedia of Database Systems, Springer US, (2009)
- IEEE Trans. Software Eng. 17(8):762-788 (1991)
- Inf. Syst. 10(1):65-76 (1985)
- Inf. Syst. 17(1):49-75 (1992)
- Inf. Syst. 17(1):77-106 (1992)
- Data Knowl. Eng. (1993)
- Data Knowl. Eng. (1993)
- ECIR, volume 3408 of Lecture Notes in Computer Science, page 421-432. Springer, (2005)
- 20, page 2002. (2002)
- Inf. Process. Manage. 31(2):191-213 (1995)
- Inf. Process. Manage. 37(1):147-161 (2001)
- Inf. Process. Manage. 35(5):655-678 (1999)
- Inf. Process. Manage. 29(1):129-144 (1993)
- Inf. Process. Manage. 28(2):181-200 (1992)


author