@article{TMF_1973_15_2_a4,
     author = {E. V. Damaskinsky},
     title = {Invariant {Weyl} systems that are not $U$-cyclic (note on {Hegerfeldt} and {Melsheimer's} paper)},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {221--226},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_15_2_a4/}
}