credits for paper ranking

Author: VergaJU

README.md

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 ## Usage
 
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+## Contributions
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+The method to obtain the number of citations and rank the papers is heavily inspired by the work of [Karen Guerrero Vazquez](https://github.com/GuerreroVazquez) and her tool [PaperMiner](https://github.com/GuerreroVazquez/Muscle_wasting/tree/master/paper_mining)