@article{DAN_1968_183_6_a9,
     author = {P. A. Shvartsman},
     title = {Analytic properties of a positively directed symplectic curve in the neighborhood of a branch point of its spectrum},
     journal = {Doklady Akademii Nauk},
     pages = {1273--1275},
     publisher = {mathdoc},
     volume = {183},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_183_6_a9/}
}