This is BibTeX, Version 0.99d (TeX Live 2019)
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The top-level auxiliary file: general_introduction.aux
White space in argument---line 104 of file general_introduction.aux
 : \citation{F\unhbox
 :                    \voidb@x \bgroup \accent 127a\penalty \@M \hskip \z@skip \egroup ssler2004}
I'm skipping whatever remains of this command
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I found no \bibstyle command---while reading file general_introduction.aux
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(There were 3 error messages)