@article{Cheng:2009,
author
=
"K.Cheng and J.Gil and L.Zhang",
title
=
"Nonthermal origin of X-rays from rotation-powered neutron stars",
journal
=
"Astrophysical Journal",
number
=
"no 493",
pages
=
"L35--L38",
year
=
"1998",
}