@article{TM_2023_321_a15,
     author = {Anastasia A. Myachkova and Alexander N. Pechen},
     title = {Some {Controllable} and {Uncontrollable} {Degenerate} {Four-Level} {Quantum} {Systems}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {237--251},
     publisher = {mathdoc},
     volume = {321},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2023_321_a15/}
}