TABLE S.1. Results relating to the application of the proposed procedure at article level. The sample is composed by the articles issued in 2008 by three scientific journals – that is, Journal of the American Society for Information Science and Technology (J1), Scientometrics (J2) and Journal of Informetrics (J3). For each article of the sample, the following data are reported: article ID No., number of citations (ci) returned by each database, number of theoretically overlapping citations (γi), and number of citations omitted (ωi) by each database. Articles are sorted in ascending order according to their DOI code (shown in the digital supplementary file)

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