This paper introduces a new computational method to automatically estimate the International Publication Ratio (IPR) based on the analysis of bibliographical productions of Brazilian research groups, a task that would be too difficult (in many cases, impossible) to be performed manually. The proposed method explores the DOI number to identify the countries of every co-author who participated in each publication. Considering the bibliometric data from the Brazilian Lattes platform we show that is possible to make a good estimation of the IPR for research groups. Calculating the IPR is important in order to make a quantitative evaluation of the science progress and to establish a comparison between the academic institutions or knowledge areas. The experiments considering research groups, belonging to the 100 more collaborative researchers of five Brazilian major knowledge areas, confirm that the our proposal leads to an effective way to infer the IPR.
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