@article{702170,
title = {The theory of small changesin the domain of existence in the theory of partial differential equations and its applications},
booktitle = {Differential Equations and Their Applications},
series = {GDML\_Books},
publisher = {Publishing House of the Czechoslovak Academy of Sciences},
address = {Prague},
year = {1963},
pages = {13-26},
mrnumber = {MR0170133},
zbl = {0156.10301},
url = {http://dml.mathdoc.fr/item/702170}
}
Babuška, I. The theory of small changesin the domain of existence in the theory of partial differential equations and its applications, dans Differential Equations and Their Applications, GDML_Books, (1963), pp. 13-26. http://gdmltest.u-ga.fr/item/702170/