How similar are field-normalized citation impact scores obtained from OpenAlex and three popular commercial databases? An empirical comparison based on large German universities

« OpenAlex is a freely available bibliographic database that can be used for bibliometric studies. In this study, we compared certain field-normalized citation scores (NCS) from OpenAlex with those from three commercial databases (Web of Science, Scopus, and Dimensions). We were interested in the question whether the NCS from OpenAlex are comparable to those from the commercial databases and can be alternatively used in evaluative bibliometrics. (…) »