@article{05169447,
title = {Two-dimensional Helmholtz spaces.},
journal = {Sibirskij Matematicheskij Zhurnal},
volume = {46},
year = {2005},
pages = {1341-1359},
zbl = {1117.51019},
language = {en},
url = {http://dml.mathdoc.fr/item/05169447}
}
Kyrov, V.A. Two-dimensional Helmholtz spaces.. Sibirskij Matematicheskij Zhurnal, Tome 46 (2005) pp. 1341-1359. http://gdmltest.u-ga.fr/item/05169447/