@article{SMZ_2005__46_6_53280,
     author = {Kyrov, V.A.},
     title = {Two-dimensional {Helmholtz} spaces.},
     journal = {Sibirskij Matematicheskij Zhurnal},
     pages = {1341},
     publisher = {mathdoc},
     volume = {46},
     number = {6},
     year = {2005},
     zbl = {1117.51019},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/SMZ_2005__46_6_53280/}
}