  The main objective of this work is to analyse the contributions of Judit
Bar-Ilan to the search engines studies. To do this, two complementary
approaches have been carried out. First, a systematic literature review of 47
publications authored and co-authored by Judit and devoted to this topic.
Second, an interdisciplinarity analysis based on the cited references
(publications cited by Judit) and citing documents (publications that cite
Judit's work) through Scopus. The systematic literature review unravels an
immense amount of search engines studied (43) and indicators measured
(especially technical precision, overlap and fluctuation over time). In
addition to this, an evolution over the years is detected from descriptive
statistical studies towards empirical user studies, with a mixture of
quantitative and qualitative methods. Otherwise, the interdisciplinary analysis
evidences that a significant portion of Judit's oeuvre was intellectually
founded on the computer sciences, achieving a significant, but not exclusively,
impact on library and information sciences.
