[0] Config.pm:312> INFO - This is Biber 2.15
[0] Config.pm:315> INFO - Logfile is 'presentation.blg'
[50] biber:330> INFO - === mer. mai 26, 2021, 18:57:21
[59] Biber.pm:415> INFO - Reading 'presentation.bcf'
[101] Utils.pm:384> WARN - No data sources defined!