@article{Cao Long:2009,
author
=
"V.Cao Long and P.Goldstein and S.Vu Ngoc",
title
=
"On existence of solitions for the second harmonic equations of a laser beam",
journal
=
"Acta Physica Polonica A",
volume
=
"Vol. 106",
number
=
"no 6",
pages
=
"843--852",
year
=
"2004",
}