This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019) (preloaded format=pdflatex 2019.10.4)  2 JUN 2021 15:19
entering extended mode
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**references.tex

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<*> references.tex
                  
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Here is how much of TeX's memory you used:
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 105 string characters out of 6129481
 57117 words of memory out of 5000000
 4025 multiletter control sequences out of 15000+600000
 3640 words of font info for 14 fonts, out of 8000000 for 9000
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!  ==> Fatal error occurred, no output PDF file produced!