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"Assuming a publication charge of € 1200 per article, scientists mentioning mitochondria or photosynthesis pay € 100 000 every day in 2021 for ‘selling’ their output to publishers ― over € 36 Mill per year."

- Gnaiger E (2021) Beyond counting papers – a mission and vision for scientific publication. https://doi.org/10.26124/bec:2021-0005

- »Paywall journalism«