@article{ZNSL_2023_523_a6,
     author = {V. M. Polyakov},
     title = {Rank $2$ vector bundles on $\mathbb{P}^1_{\mathbb{Z}}$ and quadratic forms},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {121--134},
     publisher = {mathdoc},
     volume = {523},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2023_523_a6/}
}