6.3k citations · 8.6k across the 20 of their papers we have counts for
4 papers · 1 filter
Citation analysis may severely underestimate the impact of clinical research as compared to basic research
Nees Jan van Eck, Ludo Waltman, Anthony F. J. van Raan +2
Background: Citation analysis has become an important tool for research performance assessment in the medical sciences. However, different areas of medical research may have consid…
Research collaboration and the expanding science grid: Measuring globalization processes worldwide
Robert J. W. Tijssen, Ludo Waltman, Nees Jan van Eck
This paper applies a new model and analytical tool to measure and study contemporary globalization processes in collaborative science - a world in which scientists, scholars, techn…
A new methodology for constructing a publication-level classification system of science
Ludo Waltman, Nees Jan van Eck
Classifying journals or publications into research areas is an essential element of many bibliometric analyses. Classification usually takes place at the level of journals, where t…
The Leiden Ranking 2011/2012: Data collection, indicators, and interpretation
Ludo Waltman, Clara Calero-Medina, Joost Kosten +7
The Leiden Ranking 2011/2012 is a ranking of universities based on bibliometric indicators of publication output, citation impact, and scientific collaboration. The ranking include…