@article{05165201,
title = {On counting the number of eigenvalues in the right half-plane for spectral problems connected with hyperbolic systems. II: Differential equations.},
journal = {Sibirskij Matematicheskij Zhurnal},
volume = {46},
year = {2005},
pages = {1163-1178},
zbl = {1119.35038},
language = {en},
url = {http://dml.mathdoc.fr/item/05165201}
}
Skazka, V.V. On counting the number of eigenvalues in the right half-plane for spectral problems connected with hyperbolic systems. II: Differential equations.. Sibirskij Matematicheskij Zhurnal, Tome 46 (2005) pp. 1163-1178. http://gdmltest.u-ga.fr/item/05165201/