@article{02097304,
title = {A boundary value problem for mixed-type equations in domains with multiply connected hyperbolicity subdomains.},
journal = {Sibirskij Matematicheskij Zhurnal},
volume = {44},
year = {2003},
pages = {160-177},
zbl = {1049.35146},
language = {en},
url = {http://dml.mathdoc.fr/item/02097304}
}
Lerner, M.E.; Repin, O.A. A boundary value problem for mixed-type equations in domains with multiply connected hyperbolicity subdomains.. Sibirskij Matematicheskij Zhurnal, Tome 44 (2003) pp. 160-177. http://gdmltest.u-ga.fr/item/02097304/