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. 2019 May 29;12:143. doi: 10.3389/fnmol.2019.00143

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Copyright © 2019 Yeung, Georgieva, Atanasov and Tzvetkov.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Reference publication year spectroscopy (RPYS) method. The reference lists of the 19,854 monoamine oxidase publications were analyzed using the CRExplorer software (v.1.9, 2018). References were sorted by publication year (horizontal axis), and the citation counts received by all references published in the same year were added up and visualized in bars (gray vertical axis). The waveform showed the fluctuations in the deviation of the annual citation count from its 5-year median (red vertical axis).