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WIKIPEDIA
https://de.wikipedia.org/wiki/Stefan_Graf_(Biologe)
AMAZON AUTORENSEITE
https://www.amazon.de/Dr-Stefan-Graf/e/B085XX4FX4/ref=aufs_dp_fta_dsk
YOUTUBE
https://www.youtube.com/watch?v=r3XQi3OsTvU
https://www.youtube.com/watch?v=kje5xaTdIhU
https://www.youtube.com/watch?v=CiCq8OLFQfs
https://www.youtube.com/watch?v=jsBjV0QIK6I
PODCASTs
http://fatboysrun.de/fatboysrun-episode-198-ohne-mampf-kein-dampf-mit-dr-stefan-graf/
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