@article{ZNSL_2022_519_a2,
     author = {M. I. Belishev and A. V. Kaplun},
     title = {Canonical forms of metric graph eikonal algebra and graph geometry},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {35--66},
     publisher = {mathdoc},
     volume = {519},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2022_519_a2/}
}