Evaluating Weighted Search Terms as Booleau Queries. - Hans-Peter Frei; S. Meienberg (Information Retrieval, 1991)

The Perils of Interpreting Recall and Precision Values. - Hans-Peter Frei; S. Meienberg; Peter Schäuble (Information Retrieval, 1991)

Relevance Feedback by Relative Relevance Assessments. - S. Meienberg (Information Retrieval, 1993)