| |
| 1993 | ||
|---|---|---|
| 2 | Hans-Peter Frei, Yonggang Qiu: Effectiveness of Weighted Searching in an Operational IR Environment. Information Retrieval 1993: 41-54 | |
| 1 | EE | Yonggang Qiu, Hans-Peter Frei: Concept Based Query Expansion. SIGIR 1993: 160-169 |
| 1 | Hans-Peter Frei | [1] [2] |