| 2007 | 
| 6 | EE | Sumio Fujita:
Technology survey and invalidity search: A comparative study of different tasks for Japanese patent document retrieval.
Inf. Process. Manage. 43(5): 1154-1172 (2007) | 
| 2005 | 
| 5 | EE | Sumio Fujita:
Revisiting Document Length Hypotheses: A Comparative Study of Japanese Newspaper and Patent Retrieval.
ACM Trans. Asian Lang. Inf. Process. 4(2): 207-235 (2005) | 
| 4 | EE | Sumio Fujita:
NTCIR-2 as a Rosetta stone in laboratory experiments of IR systems.
Inf. Process. Manage. 41(3): 489-506 (2005) | 
| 2001 | 
| 3 | EE | Sumio Fujita:
More Reflections on "Aboutness" TREC-2001 Evaluation Experiments at Justsystem.
TREC 2001 | 
| 2000 | 
| 2 |   | Sumio Fujita:
Evaluation of Japanese Phrasal Indexing with Large Test Collection.
RIAO 2000: 1089-1098 | 
| 1 | EE | Sumio Fujita:
Reflections on "Aboutness" TREC-9 Evaluation Experiments at Justsystem.
TREC 2000 |