Add references (#298)

Author: m-philipps

src/benchmark_refs.bib

@@ -1,3 +1,25 @@
+@article{philipps2025current,
+  title = {Current state and open problems in universal differential equations for systems biology},
+  author = {Philipps, Maren and Schmid, Nina and Hasenauer, Jan},
+  journal = {npj Systems Biology and Applications},
+  volume = {11},
+  number = {1},
+  pages = {101},
+  year = {2025},
+  publisher = {Nature Publishing Group UK London},
+}
+
+@article{persson2025petab,
+  title={PEtab. jl: advancing the efficiency and utility of dynamic modelling},
+  author={Persson, Sebastian and Fr{\"o}hlich, Fabian and Grein, Stephan and Loman, Torkel and Ognissanti, Damiano and Hasselgren, Viktor and Hasenauer, Jan and Cvijovic, Marija},
+  journal={Bioinformatics},
+  volume={41},
+  number={9},
+  pages={btaf497},
+  year={2025},
+  publisher={Oxford University Press}
+}
+
 @article{LakrisenkoPat2024,
     author = {Lakrisenko, Polina AND Pathirana, Dilan AND Weindl, Daniel AND Hasenauer, Jan},
     journal = {PLOS ONE},