@article{Abramowicz:2009,
author
=
"M.Abramowicz and W.Kluźniak",
title
=
"Epicyclic frequencies derived from the effective potential : simple and practical formulae",
journal
=
"Astrophysics and Space Science",
volume
=
"Vol. 300",
number
=
"no 1-3",
pages
=
"127--136",
year
=
"2005",
}