The number of citations is a measure of the value of a given work and the research results published in it. This number may refer to a single publication, the author's entire output, etc.

The main databases that count citations from the scientific journals are:






The h-index was proposed by J. E. Hirsch in 2005 and published in the Proceedings of the National Academy of Sciences of the United States of America.

It is the number of publications (h) with at least h citations, e.g.:

h=17 means that 17 publications were cited at least 17 times





A quartile is a statistical term that indicates the position in the collection.

The Journal Citation Reports (JCR) database indicates the Impact Factor for selected journals indexed in the Web of Science Core Collection database.It also lists the quartile of the journal in the field(s) to which it has been assigned.

The highest quartile - Q1 - includes 25% of journals with the highest IF in their field. But the journal may belong to several disciplines and in each of them it may appear in a different quartile. 

>> see the list of journals including quartiles, deciles, POBs and Clinical Medicine in the Shanghai Ranking 


Bibliography Department:
room no. 1, phone: 58 349 10 43

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On 27 April 2016 Regulation (EU) 2016/679 of the European Union and of Council came into force. It relates to data processing for natural persons and the freedom of movement of such data. In the light of this and repealing Directive 95/46/EC (General Data Protection Regulation), the Main Library would like to draw your attention to the following:

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