Update README.md

README.md

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 Join the movement! [Swiss {ai} Weeks](https://swiss-ai-weeks.ch/) calls on researchers, developers, businesses, and citizens to come together and build the future of AI — hands-on, ethical, and open. This isn't just exploration, it's collaboration in action.
 
 ## Interesting references
-- [Fine-tuning recipes for Apertus](https://github.com/swiss-ai/apertus-finetuning-recipes) on HF by the tech team
+- [Fine-tuning recipes for Apertus](https://github.com/swiss-ai/apertus-finetuning-recipes) by the tech team
+- [Apertus tech report](https://github.com/swiss-ai/apertus-tech-report/blob/main/Apertus_Tech_Report.pdf)
 
 
 ## Why this community?