Remove unused bibliographic references

docs/refs.bib

@@ -1,15 +1,4 @@
 {
-@inproceedings{stoudenmire-tnml,
- author = {Stoudenmire, Edwin and Schwab, David J},
- booktitle = {Advances in Neural Information Processing Systems},
- editor = {D. Lee and M. Sugiyama and U. Luxburg and I. Guyon and R. Garnett},
- pages = {},
- publisher = {Curran Associates, Inc.},
- title = {Supervised Learning with Tensor Networks},
- url = {https://proceedings.neurips.cc/paper_files/paper/2016/file/5314b9674c86e3f9d1ba25ef9bb32895-Paper.pdf},
- volume = {29},
- year = {2016}
-}
 @article{gray2018quimb,
   title={quimb: A python package for quantum information and many-body calculations},
   author={Gray, Johnnie},
@@ -44,16 +33,6 @@ @article{ramon2023tensorkrowch
   pages={arXiv--2306},
   year={2023}
 }
-@article{arute2019quantum,
-  title={Quantum supremacy using a programmable superconducting processor},
-  author={Arute, Frank and Arya, Kunal and Babbush, Ryan and Bacon, Dave and Bardin, Joseph C and Barends, Rami and Biswas, Rupak and Boixo, Sergio and Brandao, Fernando GSL and Buell, David A and others},
-  journal={Nature},
-  volume={574},
-  number={7779},
-  pages={505--510},
-  year={2019},
-  publisher={Nature Publishing Group}
-}
 @article{gray2021hyper,
   title={Hyper-optimized tensor network contraction},
   author={Gray, Johnnie and Kourtis, Stefanos},
@@ -63,47 +42,4 @@ @article{gray2021hyper
   year={2021},
   publisher={Verein zur F{\"o}rderung des Open Access Publizierens in den Quantenwissenschaften}
 }
-@article{boixo2018characterizing,
-  title={Characterizing quantum supremacy in near-term devices},
-  author={Boixo, Sergio and Isakov, Sergei V and Smelyanskiy, Vadim N and Babbush, Ryan and Ding, Nan and Jiang, Zhang and Bremner, Michael J and Martinis, John M and Neven, Hartmut},
-  journal={Nature Physics},
-  volume={14},
-  number={6},
-  pages={595--600},
-  year={2018},
-  publisher={Nature Publishing Group UK London}
-}
-@article{villalonga2020establishing,
-  title={Establishing the quantum supremacy frontier with a 281 pflop/s simulation},
-  author={Villalonga, Benjamin and Lyakh, Dmitry and Boixo, Sergio and Neven, Hartmut and Humble, Travis S and Biswas, Rupak and Rieffel, Eleanor G and Ho, Alan and Mandr{\`a}, Salvatore},
-  journal={Quantum Science and Technology},
-  volume={5},
-  number={3},
-  pages={034003},
-  year={2020},
-  publisher={IOP Publishing}
-}
-@article{markov2018quantum,
-  title={Quantum supremacy is both closer and farther than it appears},
-  author={Markov, Igor L and Fatima, Aneeqa and Isakov, Sergei V and Boixo, Sergio},
-  journal={arXiv preprint arXiv:1807.10749},
-  year={2018}
-}
-@misc{cotengra,
-  title={cotengra: Hyper optimized contraction trees for large tensor networks and einsums},
-  author={Gray, Johnnie},
-  year={2021},
-  howpublished={https://github.com/jcmgray/cotengra},
-  url={https://github.com/jcmgray/cotengra},
-}
-@article{arute2019quantum,
-  title={Quantum supremacy using a programmable superconducting processor},
-  author={Arute, Frank and Arya, Kunal and Babbush, Ryan and Bacon, Dave and Bardin, Joseph C and Barends, Rami and Biswas, Rupak and Boixo, Sergio and Brandao, Fernando GSL and Buell, David A and others},
-  journal={Nature},
-  volume={574},
-  number={7779},
-  pages={505--510},
-  year={2019},
-  publisher={Nature Publishing Group}
-}
 }