@article{GDZPPN002085593,
title = {On the spectrum of the reduced wave operators with cylindrical discontinuity.},
journal = {Forum mathematicum},
volume = {9},
year = {1997},
pages = {29-60},
zbl = {0870.35071},
url = {http://dml.mathdoc.fr/item/GDZPPN002085593}
}
Jäger, Willi; Saito, Yoshimi. On the spectrum of the reduced wave operators with cylindrical discontinuity.. Forum mathematicum, Tome 9 (1997) pp. 29-60. http://gdmltest.u-ga.fr/item/GDZPPN002085593/