@article{MZM_2023_113_1_a14,
     author = {Yu. L. Sachkov and E. F. Sachkova},
     title = {Sub-Lorentzian {Problem} on the {Heisenberg} {Group}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {154--157},
     year = {2023},
     volume = {113},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2023_113_1_a14/}
}