I need to cite in a scientific paper the Group Stats plugin (https://plugins.qgis.org/plugins/GroupStats/) of QGIS 3.
How should I cite it?
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For classical journal papers (printed/pdf), depending on citation style, you normally have the following information:
Not everything applies to a plugin as well, but building on this principle, you could adapt it and cite it as follows:
[Github user] HenrikSpa (2021): GroupStats plugin for QGIS 3. Originally written by Rajmund Szostok. Version 2.2.5. URL: https://github.com/HenrikSpa/GroupStats [last accessed: 2021/05/18]
For academic use, it's always good to keep a local copy of all data, software etc. you use. Otherwise, you maybe won't be able to reproduce your results (and check for errors etc.) later on. Content might get lost on the internet...