Add GAMM slides

Author: Technici4n

news/2026/03/gamm.md

@@ -13,5 +13,5 @@ The MatMat group attends the [96th annual meeting](https://jahrestagung.gamm.org
 of the German Association of Applied Mathematics and Mechanics (**GAMM**)
 in Stuttgart, Germany. As part of the session *Modelling, analysis and simulation of molecular systems*
 **Michael** will speak about [*Algorithmic differentiation for plane-wave DFT*](https://michael-herbst.com/talks/2026.03.18_GAMM.pdf)
-and **Bruno** will speak about *Quantification of Discretization Error in Plane-Wave Density Functional Theory*.
-[[Slides Michael]](https://michael-herbst.com/talks/2026.01.20_CECAM_ML_Roadmap.pdf)
+and **Bruno** will speak about [*Quantification of Discretization Error in Plane-Wave Density Functional Theory*](https://bruno.ploumhans.com/talks/2026.03.18_GAMM.pdf).
+[[Slides Michael](https://michael-herbst.com/talks/2026.03.18_GAMM.pdf), [Slides Bruno](https://bruno.ploumhans.com/talks/2026.03.18_GAMM.pdf)]