The Universities marked with one asterisk (*) have two or more webdomains, this it is not only a bad practice but also penalizes their ranking. We urge to these institutions to use only one domain and discard the other ones.

Our current policy is to choose the best ranked domain, even if the selected one is the older or no longer main webdomain. We do not currently try to merge figures from different domains anymore (Imperial, Manchester, München, Barcelona, Cardiff, Zurich, Strasbourg, Dortmünd, Illinois, Griffith).

The two asterisks (**) are reserved for very special situations:

• For the University of Helsinki a 20% of the raw numbers for size and visibility is taken out considering that the City Hall shares the same domain.
• Johns Hopkins University, its School of Medicine and other units with different domains are combined in one unique entry.
• The Caltech domain is merged with the Jet Propulsion Laboratory one (under jpl.nasa.gov).
• The portal of journals Redalyc has been excluded from the data of the Universidad Autónoma del Estado de México.
• Data from the very large repository CiteSeerX has been excluded from the calculations related to the Pennsylvania State University and the University of Arkansas Fayetteville.
• The same applies for the database DBLP regarding University of Trier in Germany, Dialnet regarding Universidad de La Rioja (Spain) and Compludoc from Universidad Complutense de Madrid and the MUSE project from University of Chicago.
• The newspaper “La Jornada” pages have been excluded from the UNAM figures.
• The Jussieu campus webdomain has been merged to the UPMC and its entry deleted.
• The City College from CUNY is included into the main list even without having independent domain.
• The different entries corresponding to the Warsaw University (Poland) and to the Universidad de la República (Uruguay) has been merged for each case.