@article{TMF_2020_202_2_a6,
     author = {H. Lakehal and M. Maamache},
     title = {Hannay angles and {Grassmannian} action-angle quantum states},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {278--289},
     publisher = {mathdoc},
     volume = {202},
     number = {2},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2020_202_2_a6/}
}