add reference

2 jobs for characteric-and-genera in 40 seconds (queued for 38 seconds)
Status Job ID Name Coverage
  Build
failed #332370
latex
generate_pdf

00:00:40

 
  Upload
skipped #332371
latex
upload_to_sciebo
 
Name Stage Failure
failed
generate_pdf Build
  Latex found 30 multiply defined reference(s)
Collected error summary (may duplicate other messages):
pdflatex: Command for 'pdflatex' gave return code 1
Refer to 'index_theory.log' for details
=== TeX engine is 'LuaHBTeX'
Latexmk: Errors, in force_mode: so I tried finishing targets
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit status 1