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Automatically abbreviate authors first names in bibtex

I had all my references (50+) with all author names spelled out, but was told to abbreviate first names to one letter (Indeed that looks better IMO too). I didn't want to do that manually, and found out that this can automatically be done by using the bibtex style "abbrv". So I set it in my latex document with

\bibliographystyle{abbrv}