@article{TMF_1999_119_3_a1,
     author = {J. Br\"uning and V. A. Geiler},
     title = {Gauge-periodic point perturbations on the {Lobachevsky} plane},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {368--380},
     publisher = {mathdoc},
     volume = {119},
     number = {3},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1999_119_3_a1/}
}