SPIDER Retrieval System at TREC-5. - Jean Paul Ballerini; Marco Büchel; Ruxandra Domenig; Daniel Knaus; Bojidar Mateev; Elke Mittendorf; Peter Schäuble; Paraic Sheridan; Martin Wechsler (TREC, 1996)

Where the Linked Dependence Assumption Fails and How to Move Beyond It. - Bojidar Mateev; Elke Mittendorf; Peter Schäuble (BCS-IRSG Annual Colloquium on IR Research, 1997)

ETH TREC-6: Routing, Chinese, Cross-Language and Spoken Document Retrieval. - Bojidar Mateev; Eugen Munteanu; Paraic Sheridan; Martin Wechsler; Peter Schäuble (TREC, 1997)

SPIDER Retrieval System at TREC7. - Martin Braschler; Bojidar Mateev; Elke Mittendorf; Peter Schäuble; Martin Wechsler (TREC, 1998)

Using the Co-occurrence of Words for Retrieval Weighting. - Elke Mittendorf; Bojidar Mateev; Peter Schäuble (Inf. Retr., 2000)